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Unicameralism (from ''uni''- "one" + Latin ''camera'' "chamber") is a type of
legislature A legislature is an assembly with the authority to make laws for a political entity such as a country or city. They are often contrasted with the executive and judicial powers of government. Laws enacted by legislatures are usually known ...
, which consists of one house or assembly, that legislates and votes as one. Unicameral legislatures exist when there is no widely perceived need for multicameralism ( two or more chambers). Many multicameral legislatures were created to give separate voices to different sectors of society. Multiple houses allowed, for example, for a guaranteed representation of different social classes (as in the
Parliament of the United Kingdom The Parliament of the United Kingdom is the supreme legislative body of the United Kingdom, the Crown Dependencies and the British Overseas Territories. It meets at the Palace of Westminster, London. It alone possesses legislative suprem ...
or the
French States-General In France under the Ancien Régime, the Estates General (french: États généraux ) or States-General was a legislative and consultative assembly of the different classes (or estates) of French subjects. It had a separate assembly for each of ...
). Sometimes, as in
New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island coun ...
and
Denmark ) , song = ( en, "King Christian stood by the lofty mast") , song_type = National and royal anthem , image_map = EU-Denmark.svg , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of Denmark , establish ...
, unicameralism comes about through the abolition of one of two bicameral chambers, or, as in
Sweden Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic countries, Nordic c ...
, through the merger of the two chambers into a single one, while in others a second chamber has never existed from the beginning.


Rationale for unicameralism and criticism

The principal advantage of a unicameral system is more efficient lawmaking, as the legislative process is simpler and there is no possibility of deadlock between two chambers. Proponents of unicameralism have also argued that it reduces costs, even if the number of legislators stays the same, since there are fewer institutions to maintain and support financially and that it is more democratic. Proponents of
bicameral Bicameralism is a type of legislature, one divided into two separate assemblies, chambers, or houses, known as a bicameral legislature. Bicameralism is distinguished from unicameralism, in which all members deliberate and vote as a single gr ...
legislatures say that having two legislative chambers offers the opportunity to re-debate and correct errors in either chamber in parallel, and in some cases to introduce legislation in either chamber. The main weakness of a unicameral system can be seen as potential lack of restraint on the majority, particularly noticeable in
parliamentary system A parliamentary system, or parliamentarian democracy, is a system of democratic governance of a state (or subordinate entity) where the executive derives its democratic legitimacy from its ability to command the support ("confidence") of th ...
s where the leaders of the parliamentary majority also dominate the
executive Executive ( exe., exec., execu.) may refer to: Role or title * Executive, a senior management role in an organization ** Chief executive officer (CEO), one of the highest-ranking corporate officers (executives) or administrators ** Executive di ...
. There is also the risk that important sectors of society may not be adequately represented by the elected singular body.


List of unicameral legislatures

Approximately half of the world's
sovereign state A sovereign state or sovereign country, is a political entity represented by one central government that has supreme legitimate authority over territory. International law defines sovereign states as having a permanent population, defined ter ...
s are currently unicameral. The
People's Republic of China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's List of countries and dependencies by population, most populous country, with a Population of China, population exceeding 1.4 billion, slig ...
is somewhat in-between, with a legislature and a formal advisory body. China has a Chinese People's Political Consultative Conference which meets alongside the National People's Congress, in many respects an advisory "upper house". Many subnational entities have unicameral legislatures. These include the state of
Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the sout ...
and territories of
Guam Guam (; ch, Guåhan ) is an organized, unincorporated territory of the United States in the Micronesia subregion of the western Pacific Ocean. It is the westernmost point and territory of the United States (reckoned from the geographic cent ...
and the Virgin Islands in the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...
, the Chinese
special administrative regions The special administrative regions (SAR) of the People's Republic of China are one of the provincial-level administrative divisions of the People's Republic of China directly under the control of its Central People's Government (State Co ...
of
Hong Kong Hong Kong ( (US) or (UK); , ), officially the Hong Kong Special Administrative Region of the People's Republic of China (abbr. Hong Kong SAR or HKSAR), is a List of cities in China, city and Special administrative regions of China, special ...
and
Macao Macau or Macao (; ; ; ), officially the Macao Special Administrative Region of the People's Republic of China (MSAR), is a city and special administrative region of China in the western Pearl River Delta by the South China Sea. With a po ...
, the
Australia Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. With an area of , Australia is the largest country by ...
n state of
Queensland ) , nickname = Sunshine State , image_map = Queensland in Australia.svg , map_caption = Location of Queensland in Australia , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , establishe ...
as well as the Northern Territory and the
Australian Capital Territory The Australian Capital Territory (commonly abbreviated as ACT), known as the Federal Capital Territory (FCT) until 1938, is a landlocked federal territory of Australia containing the national capital Canberra and some surrounding township#Aust ...
, a majority of the provinces of Argentina, all of the provinces and territories in
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by to ...
, all of the German states, all of the regions of Italy, all of the
Spanish autonomous communities eu, autonomia erkidegoa ca, comunitat autònoma gl, comunidade autónoma oc, comunautat autonòma an, comunidat autonoma ast, comunidá autónoma , alt_name = , map = , category = Autonomous administra ...
, both the autonomous regions of Portugal, most of the
states and union territories of India India is a federal union comprising 28 states and 8 union territories, with a total of 36 entities. The states and union territories are further subdivided into districts and smaller administrative divisions. History Pre-indep ...
, and all of the
states of Brazil The federative units of Brazil ( pt, unidades federativas do Brasil) are subnational entities with a certain degree of autonomy (self-government, self-regulation and self-collection) and endowed with their own government and constitution, which ...
. In the
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and ...
, the devolved Scottish Parliament, the Senedd Cymru, the Northern Ireland Assembly, and the London Assembly are also unicameral.


National (UN member states and observers)


Federal

* Assembly of the Union of the Comoros *
Bundestag The Bundestag (, "Federal Diet") is the German federal parliament. It is the only federal representative body that is directly elected by the German people. It is comparable to the United States House of Representatives or the House of Comm ...
of Germany * Council of Representatives of Iraq (provision exists for the founding of a "Council of Union", but no move to this effect has been initiated by the existing Council) *
Congress A congress is a formal meeting of the representatives of different countries, constituent states, organizations, trade unions, political parties, or other groups. The term originated in Late Middle English to denote an encounter (meeting of ...
of the Federated States of Micronesia *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Saint Kitts and Nevis * Federal National Council of the United Arab Emirates *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Venezuela


Unitary


=Africa

= *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Angola *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Benin *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Botswana *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Burkina Faso *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Cape Verde *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of the Central African Republic *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Chad *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Djibouti *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Eritrea *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of The Gambia *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Ghana *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Guinea * National People's Assembly of Guinea-Bissau * House of Representatives of Libya *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Malawi * Majlis of Maldives *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Mali *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Mauritania *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Mauritius * Assembly of the Republic of Mozambique *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Niger *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of São Tomé and Príncipe *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Senegal *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Seychelles *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Sierra Leone *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Tanzania *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Togo *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Tunisia *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Uganda *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Zambia


=Asia

= * Leadership Council of Afghanistan *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Armenia *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Azerbaijan * Jatiya Sangsad of Bangladesh * Legislative Council of Brunei * National People's Congress of the People's Republic of China – though they also have a Chinese People's Political Consultative Conference which is effectively an advisory "upper house". * National Parliament of East Timor *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Georgia * Islamic Consultative Assembly of Iran *
Knesset The Knesset ( he, הַכְּנֶסֶת ; "gathering" or "assembly") is the unicameral legislature of Israel. As the supreme state body, the Knesset is sovereign and thus has complete control of the entirety of the Israeli government (wit ...
of Israel * Supreme People's Assembly of the Democratic People's Republic of Korea (North Korea) *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of the Republic of Korea (South Korea) *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Kuwait * Supreme Council of Kyrgyzstan *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Laos *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Lebanon * State Great Khural of Mongolia * Legislative Council of Palestine * Consultative Assembly of Qatar * Consultative Assembly of Saudi Arabia (most powers are reserved for the
King King is the title given to a male monarch in a variety of contexts. The female equivalent is queen regnant, queen, which title is also given to the queen consort, consort of a king. *In the context of prehistory, antiquity and contempora ...
) *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Singapore *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Sri Lanka *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Syria * Grand National Assembly of Turkey *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Vietnam


=Europe

= * Kuvendi of Albania *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Bulgaria * Sabor of Croatia *
Folketing The Folketing ( da, Folketinget, ; ), also known as the Parliament of Denmark or the Danish Parliament in English, is the unicameral national legislature ( parliament) of the Kingdom of Denmark—Denmark proper together with the Faroe Islands ...
of Denmark * Riigikogu of Estonia *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Finland *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Greece *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Hungary *
Althing The Alþingi (''general meeting'' in Icelandic, , anglicised as ' or ') is the supreme national parliament of Iceland. It is one of the oldest surviving parliaments in the world. The Althing was founded in 930 at (" thing fields" or "assemb ...
of Iceland * Saeima of Latvia * Landtag of Liechtenstein *
Seimas The Seimas of the Republic of Lithuania ( lt, Lietuvos Respublikos Seimas), or simply the Seimas (), is the unicameral parliament of Lithuania. The Seimas constitutes the legislative branch of government in Lithuania, enacting laws and amendm ...
of Lithuania *
Chamber of Deputies The chamber of deputies is the lower house in many bicameral legislatures and the sole house in some unicameral legislatures. Description Historically, French Chamber of Deputies was the lower house of the French Parliament during the Bourbon R ...
of Luxembourg *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Malta *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Moldova * National Council of Monaco *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Montenegro * Assembly of North Macedonia *
Storting The Storting ( no, Stortinget ) (lit. the Great Thing) is the supreme legislature of Norway, established in 1814 by the Constitution of Norway. It is located in Oslo. The unicameral parliament has 169 members and is elected every four years ...
of Norway * Assembly of the Republic of Portugal * Grand and General Council of San Marino *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Serbia * National Council of Slovakia * Riksdag of Sweden * Verkhovna Rada of Ukraine * Pontifical Commission for Vatican City


=North America

= * Legislative Assembly of Costa Rica *
National Assembly of People's Power The National Assembly of People's Power ( es, Asamblea Nacional del Poder Popular) is the unicameral parliament of the Republic of Cuba. It is currently composed of 605 representatives who are elected from multi-member electoral districts for ...
of Cuba *
House of Assembly House of Assembly is a name given to the legislature or lower house of a bicameral parliament. In some countries this may be at a subnational level. Historically, in British Crown colonies A Crown colony or royal colony was a colony adm ...
of Dominica * Legislative Assembly of El Salvador *
Congress A congress is a formal meeting of the representatives of different countries, constituent states, organizations, trade unions, political parties, or other groups. The term originated in Late Middle English to denote an encounter (meeting of ...
of Guatemala *
National Congress ''National Congress'' is a term used in the names of various political parties and legislatures . Political parties *Ethiopia: Oromo National Congress *Guyana: People's National Congress (Guyana) *India: Indian National Congress *Iraq: Iraqi Nati ...
of Honduras *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Nicaragua *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Panama *
House of Assembly House of Assembly is a name given to the legislature or lower house of a bicameral parliament. In some countries this may be at a subnational level. Historically, in British Crown colonies A Crown colony or royal colony was a colony adm ...
of Saint Vincent and the Grenadines


=Oceania

= *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of the Cook Islands *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Fiji *
House of Assembly House of Assembly is a name given to the legislature or lower house of a bicameral parliament. In some countries this may be at a subnational level. Historically, in British Crown colonies A Crown colony or royal colony was a colony adm ...
of Kiribati *
Legislature A legislature is an assembly with the authority to make laws for a political entity such as a country or city. They are often contrasted with the executive and judicial powers of government. Laws enacted by legislatures are usually known ...
of the Marshall Islands *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Nauru *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of New Zealand * Assembly of Niue * National Parliament of Papua New Guinea * Legislative Assembly of Samoa * National Parliament of Solomon Islands * Legislative Assembly of Tonga *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Tuvalu *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Vanuatu


=South America

= *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Ecuador *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Guyana * Congress of the Republic of Peru *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Suriname


Territorial

*
House of Assembly House of Assembly is a name given to the legislature or lower house of a bicameral parliament. In some countries this may be at a subnational level. Historically, in British Crown colonies A Crown colony or royal colony was a colony adm ...
of the British Virgin Islands * Legislative Assembly of the Cayman Islands * Legislative Assembly of the Falkland Islands * The Løgting of the Faroe Islands *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Gibraltar * Inatsisartut of Greenland *
Legislature A legislature is an assembly with the authority to make laws for a political entity such as a country or city. They are often contrasted with the executive and judicial powers of government. Laws enacted by legislatures are usually known ...
of Guam * Legislative Council of Hong Kong * Legislative Assembly of Macao *
House of Assembly House of Assembly is a name given to the legislature or lower house of a bicameral parliament. In some countries this may be at a subnational level. Historically, in British Crown colonies A Crown colony or royal colony was a colony adm ...
of Tobago *
Legislature A legislature is an assembly with the authority to make laws for a political entity such as a country or city. They are often contrasted with the executive and judicial powers of government. Laws enacted by legislatures are usually known ...
of the U.S. Virgin Islands


State parliaments with limited recognition

* People's Assembly of Abkhazia *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of the Republic of Artsakh * Assembly of Kosovo * Assembly of the Republic of Northern Cyprus * National Council of the Sahrawi Arab Democratic Republic *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of South Ossetia * Legislative Yuan of the Republic of China (Taiwan) * Supreme Council of Transnistria


Subnational


Federations

* All legislatures and legislative councils of the regions and communities of Belgium * All legislative assemblies in all states of Brazil * All legislative assemblies of the provinces and territories of Canada * All Landtage of the states of Germany * All legislative assemblies of the states of Malaysia * All legislatures in all states of Mexico * All legislatures of the provinces in Nepal * All legislatures of the provinces and territories in Pakistan * The
legislature A legislature is an assembly with the authority to make laws for a political entity such as a country or city. They are often contrasted with the executive and judicial powers of government. Laws enacted by legislatures are usually known ...
of the state of Nebraska, and council of the District of Columbia in the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...
*
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of Queensland and the legislative assemblies of the
territories A territory is an area of land, sea, or space, particularly belonging or connected to a country, person, or animal. In international politics, a territory is usually either the total area from which a state may extract power resources or a ...
of Australia (but not the other states) * Provincial legislatures of the provinces of South Africa * Narodna skupština of Republika Srpska * 15 of the provinces of Argentina – Chaco, Chubut, Córdoba, Formosa, Jujuy, La Pampa, La Rioja, Misiones, Neuquén, Río Negro, San Juan, Santa Cruz, Santiago del Estero, Tierra del Fuego, Tucumán, and the autonomous city of Buenos Aires. * 22 of the states of India –
Arunachal Pradesh Arunachal Pradesh (, ) is a state in Northeastern India. It was formed from the erstwhile North-East Frontier Agency (NEFA) region, and became a state on 20 February 1987. It borders the states of Assam and Nagaland to the south. It shares ...
,
Assam Assam (; ) is a state in northeastern India, south of the eastern Himalayas along the Brahmaputra and Barak River valleys. Assam covers an area of . The state is bordered by Bhutan and Arunachal Pradesh to the north; Nagaland and Manipur ...
, Chhattisgarh, Goa,
Gujarat Gujarat (, ) is a state along the western coast of India. Its coastline of about is the longest in the country, most of which lies on the Kathiawar peninsula. Gujarat is the fifth-largest Indian state by area, covering some ; and the ninth ...
,
Haryana Haryana (; ) is an Indian state located in the northern part of the country. It was carved out of the former state of East Punjab on 1 Nov 1966 on a linguistic basis. It is ranked 21st in terms of area, with less than 1.4% () of India's land ...
,
Himachal Pradesh Himachal Pradesh (; ; "Snow-laden Mountain Province") is a state in the northern part of India. Situated in the Western Himalayas, it is one of the thirteen mountain states and is characterized by an extreme landscape featuring several pea ...
,
Jharkhand Jharkhand (; ; ) is a state in eastern India. The state shares its border with the states of West Bengal to the east, Chhattisgarh to the west, Uttar Pradesh to the northwest, Bihar to the north and Odisha to the south. It has an area of . I ...
,
Kerala Kerala ( ; ) is a state on the Malabar Coast of India. It was formed on 1 November 1956, following the passage of the States Reorganisation Act, by combining Malayalam-speaking regions of the erstwhile regions of Cochin, Malabar, South Ca ...
,
Madhya Pradesh Madhya Pradesh (, ; meaning 'central province') is a state in central India. Its capital is Bhopal, and the largest city is Indore, with Jabalpur, Ujjain, Gwalior, Sagar, and Rewa being the other major cities. Madhya Pradesh is the second ...
,
Manipur Manipur () ( mni, Kangleipak) is a state in Northeast India, with the city of Imphal as its capital. It is bounded by the Indian states of Nagaland to the north, Mizoram to the south and Assam to the west. It also borders two regions of ...
,
Meghalaya Meghalaya (, or , meaning "abode of clouds"; from Sanskrit , "cloud" + , "abode") is a state in northeastern India. Meghalaya was formed on 21 January 1972 by carving out two districts from the state of Assam: (a) the United Khasi Hills and J ...
,
Mizoram Mizoram () is a state in Northeast India, with Aizawl as its seat of government and capital city. The name of the state is derived from "Mizo", the self-described name of the native inhabitants, and "Ram", which in the Mizo language means "lan ...
, Nagaland,
Odisha Odisha (English: , ), formerly Orissa ( the official name until 2011), is an Indian state located in Eastern India. It is the 8th largest state by area, and the 11th largest by population. The state has the third largest population of ...
,
Punjab Punjab (; Punjabi Language, Punjabi: پنجاب ; ਪੰਜਾਬ ; ; also Romanization, romanised as ''Panjāb'' or ''Panj-Āb'') is a geopolitical, cultural, and historical region in South Asia, specifically in the northern part of the I ...
,
Rajasthan Rajasthan (; lit. 'Land of Kings') is a state in northern India. It covers or 10.4 per cent of India's total geographical area. It is the largest Indian state by area and the seventh largest by population. It is on India's northwestern ...
,
Sikkim Sikkim (; ) is a state in Northeastern India. It borders the Tibet Autonomous Region of China in the north and northeast, Bhutan in the east, Province No. 1 of Nepal in the west and West Bengal in the south. Sikkim is also close to the Sil ...
,
Tamil Nadu Tamil Nadu (; , TN) is a state in southern India. It is the tenth largest Indian state by area and the sixth largest by population. Its capital and largest city is Chennai. Tamil Nadu is the home of the Tamil people, whose Tamil language ...
, Tripura, Uttarakhand, and
West Bengal West Bengal (, Bengali: ''Poshchim Bongo'', , abbr. WB) is a state in the eastern portion of India. It is situated along the Bay of Bengal, along with a population of over 91 million inhabitants within an area of . West Bengal is the fou ...
; and 3 of the union territories –
Delhi Delhi, officially the National Capital Territory (NCT) of Delhi, is a city and a union territory of India containing New Delhi, the capital of India. Straddling the Yamuna river, primarily its western or right bank, Delhi shares borders w ...
,
Jammu and Kashmir Jammu and Kashmir may refer to: * Kashmir, the northernmost geographical region of the Indian subcontinent * Jammu and Kashmir (union territory), a region administered by India as a union territory * Jammu and Kashmir (state), a region administered ...
, and Puducherry.


Devolved governments

* Iraqi Kurdistan
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
* Northern Ireland Assembly * Scottish Parliament * Senedd (Welsh Parliament) * Parliaments of the autonomous communities of Spain * All regional councils of France * Bangsamoro
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
* All Oblast Councils of Ukraine * City and County Councils of the special municipalities, provincial cities, and counties of the Republic of China (Taiwan)


Others

* Local People's Congresses of all levels of provinces, regions, and municipalities of the People's Republic of China * National Council of the Palestine Liberation Organization


List of historical unicameral legislatures


National

* The First Protectorate Parliament and Second Protectorate Parliament of the
Kingdom of England The Kingdom of England (, ) was a sovereign state on the island of Great Britain from 12 July 927, when it emerged from various Anglo-Saxon kingdoms, until 1 May 1707, when it united with Scotland to form the Kingdom of Great Britain. On ...
, regulated by the Instrument of Government (dissolved) *
Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...
of the
Kingdom of Scotland The Kingdom of Scotland (; , ) was a sovereign state in northwest Europe traditionally said to have been founded in 843. Its territories expanded and shrank, but it came to occupy the northern third of the island of Great Britain, sharing a l ...
until 1707 (dissolved) * Congress of the Confederation was unicameral before being replaced in 1789 by the current, bicameral United States Congress. * Provisional Congress of the Confederate States was unicameral before being replaced by the bicameral Confederate States Congress in 1862. *
Congress of Deputies The Congress of Deputies ( es, link=no, Congreso de los Diputados, italic=unset) is the lower house of the Cortes Generales, Spain's legislative branch. The Congress meets in the Palacio de las Cortes, Madrid, Palace of the Parliament () in Ma ...
of
Second Spanish Republic The Spanish Republic (), commonly known as the Second Spanish Republic (), was the form of government in Spain from 1931 to 1939. The Republic was proclaimed on 14 April 1931, after the deposition of King Alfonso XIII, and was dissolved on 1 ...
was unicameral between 1931 and 1936. Dissolved at the end of
Spanish Civil War The Spanish Civil War ( es, Guerra Civil Española)) or The Revolution ( es, La Revolución, link=no) among Nationalists, the Fourth Carlist War ( es, Cuarta Guerra Carlista, link=no) among Carlism, Carlists, and The Rebellion ( es, La Rebeli ...
* The Parliament of Uzbekistan was unicameral before being replaced in 2005 by the current, bicameral Oliy Majlis. *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of
Cameroon Cameroon (; french: Cameroun, ff, Kamerun), officially the Republic of Cameroon (french: République du Cameroun, links=no), is a country in west-central Africa. It is bordered by Nigeria to the west and north; Chad to the northeast; the ...
was unicameral before being replaced in 2013 by the current, bicameral Parliament of Cameroon. * Chamber of People's Representative of Equatorial Guinea was unicameral before being replaced in 2013 by the current, bicameral Parliament of Equatorial Guinea. *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of
Kenya ) , national_anthem = " Ee Mungu Nguvu Yetu"() , image_map = , map_caption = , image_map2 = , capital = Nairobi , coordinates = , largest_city = Nairobi , ...
was the country's unicameral legislature before becoming the lower house of the bicameral Parliament of Kenya in 2013. *
National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the r ...
of Ivory Coast was the country's unicameral legislature before becoming the lower house of the bicameral Parliament of Ivory Coast in 2016. * Central National Committee and the
Provisional People's Representative Council The Provisional People's Representative Council ( id, Dewan Perwakilan Rakyat Sementara) was the first Indonesian legislature under the Provisional Constitution of 1950. The council was formed after the transition of Indonesia to a unitary sta ...
of
Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Gui ...
was the unicameral legislature of the Republic of Indonesia during the
War of Independence This is a list of wars of independence (also called liberation wars). These wars may or may not have been successful in achieving a goal of independence. List See also * Lists of active separatist movements * List of civil wars * List of ...
and the Liberal democracy era.


Subnational

*
General Assembly A general assembly or general meeting is a meeting of all the members of an organization or shareholders of a company. Specific examples of general assembly include: Churches * General Assembly (presbyterian church), the highest court of pres ...
of Georgia until 1789 *
General Assembly A general assembly or general meeting is a meeting of all the members of an organization or shareholders of a company. Specific examples of general assembly include: Churches * General Assembly (presbyterian church), the highest court of pres ...
of
Pennsylvania Pennsylvania (; ( Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, ...
until 1790 *
General Assembly A general assembly or general meeting is a meeting of all the members of an organization or shareholders of a company. Specific examples of general assembly include: Churches * General Assembly (presbyterian church), the highest court of pres ...
of
Vermont Vermont () is a U.S. state, state in the northeast New England region of the United States. Vermont is bordered by the states of Massachusetts to the south, New Hampshire to the east, and New York (state), New York to the west, and the Provin ...
until 1836


Other

* Assembly of Representatives of
Yishuv Yishuv ( he, ישוב, literally "settlement"), Ha-Yishuv ( he, הישוב, ''the Yishuv''), or Ha-Yishuv Ha-Ivri ( he, הישוב העברי, ''the Hebrew Yishuv''), is the body of Jewish residents in the Land of Israel (corresponding to the ...
community in
Mandatory Palestine Mandatory Palestine ( ar, فلسطين الانتدابية '; he, פָּלֶשְׂתִּינָה (א״י) ', where "E.Y." indicates ''’Eretz Yiśrā’ēl'', the Land of Israel) was a geopolitical entity established between 1920 and 1948 ...
from 1920 to 1949


Unicameralism in the Philippines

Though the current
Congress of the Philippines The Congress of the Philippines ( fil, Kongreso ng Pilipinas, italic=unset) is the legislature of the national government of the Philippines. It is bicameral, composed of a lower body, the House of Representatives, although colloquially the ...
is bicameral, the country experienced unicameralism in 1898 and 1899 (during the First Philippine Republic), from 1935 to 1941 (the Commonwealth era) and from 1943 to 1944 (during the Japanese occupation). Under the 1973 Constitution, the legislative body was called Batasang Pambansa, which functioned also a unicameral legislature within a
parliamentary system A parliamentary system, or parliamentarian democracy, is a system of democratic governance of a state (or subordinate entity) where the executive derives its democratic legitimacy from its ability to command the support ("confidence") of th ...
(1973-1981) and a semi-presidential system (1981-1986) form of government. The ongoing process of amending or revising the current Constitution and form of government is popularly known as
Charter Change A constitutional amendment is a modification of the constitution of a polity, organization or other type of entity. Amendments are often interwoven into the relevant sections of an existing constitution, directly altering the text. Conversely ...
. A shift to a unicameral parliament was included in the proposals of the constitutional commission created by President
Gloria Macapagal Arroyo Maria Gloria Macaraeg Macapagal Arroyo (, born April 5, 1947), often referred to by her initials GMA, is a Filipino academic and politician serving as one of the House Deputy Speakers since 2022, and previously from 2016 to 2017. She previously ...
. Unlike in the United States, senators in the Senate of the Philippines are elected not per district and state but nationally; the
Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...
is a
unitary state A unitary state is a sovereign state governed as a single entity in which the central government is the supreme authority. The central government may create (or abolish) administrative divisions (sub-national units). Such units exercise only th ...
. The Philippine government's decision-making process, relative to the United States, is more rigid, highly centralised, much slower and susceptible to political gridlock. As a result, the trend for unicameralism as well as other political system reforms are more contentious in the Philippines. While Congress is bicameral, all local legislatures are unicameral: the
Bangsamoro Parliament , legislature = 2nd BTA (Interim) Parliament , linking_name = , coa_pic = Bangsamoro_Parliament_Seal.png , coa_res = , session_room = File:BARMM lawmakers refile local governance code.jpg , sessi ...
, the Sangguniang Panlalawigan (Provincial Boards), Sangguniang Panlungsod (City Councils), Sangguniang Bayan (Municipal Councils),
Sangguniang Barangay The Sangguniang Barangay, also known as the Barangay Council, and formerly as the Rural Council and then the Barrio Council, is the legislative body of a barangay, the lowest form of government in the Philippines. The term is coined from the Ta ...
(
Barangay A barangay (; abbreviated as Brgy. or Bgy.), historically referred to as barrio (abbreviated as Bo.), is the smallest administrative division in the Philippines and is the native Filipino term for a village, district, or ward. In metropolita ...
Councils), and the Sangguniang Kabataan (Youth Councils).


Unicameralism in the United States

The Nebraska Legislature (also called the Unicameral) is the supreme legislative body of the state of Nebraska and the only unicameral state legislature in the United States. Its members are called "senators", as it was originally the upper house of a bicameral legislature before the Nebraska House of Representatives dissolved in 1937. The legislature is also notable for being nonpartisan and officially recognizes no party affiliation, making Nebraska unique among U.S. states. With 49 members, it is also the smallest legislature of any U.S. state. A 2018 study found that efforts to adopt unicameralism in Ohio and Missouri failed due to rural opposition. There was a fear in rural communities that unicameralism would diminish their influence in state government. Local government legislatures of counties, cities, or other political subdivisions within states are usually unicameral and have limited lawmaking powers compared to their state and federal counterparts. Some of the 13 colonies which became independent, such as
Pennsylvania Pennsylvania (; ( Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, ...
,
New Jersey New Jersey is a state in the Mid-Atlantic and Northeastern regions of the United States. It is bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delawa ...
and
New Hampshire New Hampshire is a U.S. state, state in the New England region of the northeastern United States. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Gulf of Maine to the east, and the Canadian province of Quebec t ...
had initially introduced strong unicameral legislature and (relatively) less powerful governors with no veto power. Pennsylvania's constitution lasted only 14 years. In 1790, conservatives gained power in the state legislature, called a new constitutional convention, and rewrote the constitution. The new constitution substantially reduced universal male suffrage, gave the governor veto power and patronage appointment authority, and added an upper house with substantial wealth qualifications to the unicameral legislature.
Thomas Paine Thomas Paine (born Thomas Pain; – In the contemporary record as noted by Conway, Paine's birth date is given as January 29, 1736–37. Common practice was to use a dash or a slash to separate the old-style year from the new-style year. In th ...
called it a constitution unworthy of America. In 1999, Governor Jesse Ventura proposed converting the Minnesota Legislature into a single chamber. Although debated, the idea was never adopted. Seven U.S. states,
Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...
,
Idaho Idaho ( ) is a U.S. state, state in the Pacific Northwest region of the Western United States. To the north, it shares a small portion of the Canada–United States border with the province of British Columbia. It borders the states of Monta ...
,
Maryland Maryland ( ) is a state in the Mid-Atlantic region of the United States. It shares borders with Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware and the Atlantic Ocean t ...
,
New Jersey New Jersey is a state in the Mid-Atlantic and Northeastern regions of the United States. It is bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delawa ...
,
North Dakota North Dakota () is a U.S. state in the Upper Midwest, named after the indigenous Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north and by the U.S. states of Minnesota to the east, ...
,
South Dakota South Dakota (; Sioux: , ) is a U.S. state in the North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Lakota and Dakota Sioux Native American tribes, who comprise a large po ...
, and
Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...
, effectively have two-house unicamerals. In these states, districts in the upper house and the lower house are combined into a single constituency, a practice known as nesting. The U.S. territory of Puerto Rico held a non-binding referendum in 2005. Voters approved changing its Legislative Assembly to a unicameral body by 456,267 votes in favor (83.7%) versus 88,720 against (16.3%). If both the territory's House of Representatives and Senate had approved by a vote the specific amendments to the Puerto Rico Constitution that are required for the change to a unicameral legislature, another referendum would have been held in the territory to approve such amendments. If those constitutional changes had been approved, Puerto Rico could have switched to a unicameral legislature as early as 2015. On June 9, 2009, the Maine House of Representatives voted to form a unicameral legislature, but the measure did not pass the Senate. Because of
legislative gridlock In politics, gridlock or deadlock or political stalemate is a situation when there is difficulty passing laws that satisfy the needs of the people. A government is gridlocked when the ratio between bills passed and the agenda of the legislat ...
in 2009, former Congressman Rick Lazio, a prospective candidate for governor, has proposed that New York adopt unicameralism. The United States as a whole was subject to a unicameral Congress during the years 1781–1788, when the Articles of Confederation were in effect. The
Confederate States of America The Confederate States of America (CSA), commonly referred to as the Confederate States or the Confederacy was an unrecognized breakaway republic in the Southern United States that existed from February 8, 1861, to May 9, 1865. The Confeder ...
, pursuant to its Provisional Constitution, in effect from February 8, 1861, to February 22, 1862, was governed by a unicameral Congress.


Notes


References

{{Authority control Legislatures