A petty officer (PO) is a
non-commissioned officer
A non-commissioned officer (NCO) is an enlisted rank, enlisted leader, petty officer, or in some cases warrant officer, who does not hold a Commission (document), commission. Non-commissioned officers usually earn their position of authority b ...
in many
navies. Often they may be
superior to a
seaman, and subordinate to more senior non-commissioned officers, such as
chief petty officers.
Petty officers are usually sailors that have served at least several years in their respective navies. Petty officers represent the junior and mid-grade non-commissioned officer ranks of many naval services, and are generally responsible for the day-to-day supervision of ranks junior to them. They may also serve as technical specialists within their
rating (military occupation).
Origin

The modern petty officer dates back to the
Age of Sail
The Age of Sail is a period in European history that lasted at the latest from the mid-16th (or mid-15th) to the mid-19th centuries, in which the dominance of sailing ships in global trade and warfare culminated, particularly marked by the int ...
in the
Royal Navy
The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...
. Petty officers
rank between naval
officers (both
commissioned and
warrant) and most
enlisted sailor
A sailor, seaman, mariner, or seafarer is a person who works aboard a watercraft as part of its crew, and may work in any one of a number of different fields that are related to the operation and maintenance of a ship. While the term ''sailor'' ...
s. These were men with some claim to officer rank, sufficient to distinguish them from ordinary
ratings, without raising them so high as the sea officers. Several were warrant officers, in the literal sense of being appointed by
warrant, and like the warrant sea officers, their superiors, they were usually among the specialists of the ship's company.
The ''Oxford English Dictionary'' suggests that the title derives from the Anglo-Norman and Middle French "", meaning "of small size, small, little".
Two of the Royal Navy petty officer's rates,
midshipman
A midshipman is an officer of the lowest Military rank#Subordinate/student officer, rank in the Royal Navy, United States Navy, and many Commonwealth of Nations, Commonwealth navies. Commonwealth countries which use the rank include Royal Cana ...
and
master's mate
Master's mate is an obsolete rating which was used by the British Royal Navy, Royal Navy, United States Navy and merchant services in both countries for a senior petty officer who assisted the sailing master, master. Master's mates evolved into th ...
, were a superior petty officer with a more general authority, but they remained no more than ratings. However, it was quite possible for a warrant officer (such as the armourer), in his role as a superior officer, to be
court-martial
A court-martial (plural ''courts-martial'' or ''courts martial'', as "martial" is a postpositive adjective) is a military court or a trial conducted in such a court. A court-martial is empowered to determine the guilt of members of the arme ...
ed for striking a midshipman. This is because the midshipman was regarded as future sea officer, with the all-important social distinction of having the right to walk the
quarterdeck. Midshipmen wore distinctive uniforms, master's mates dressed respectably, and both behaved like officers. The master's mate rating evolved into the rank of
sub-lieutenant, and midshipman evolved into
naval cadet.
In the same administrative reforms of the 1860s that created the rank of Sub-lieutenant, two grades of Petty Officer were established for senior ratings — Petty Officer Second Class and Petty Officer First Class, the latter usually being achieved by men who had served as a PO 2nd Class with good conduct for six years. PO2s wore 'square rig' (the traditional
sailor suit worn by junior ratings) while PO1s wore 'fore and aft' rig like
chief petty officers and above. PO2s wore insignia of a
fouled anchor (as for
leading hands) but surmounted by a crown, while the insignia of a PO1 was a pair of crossed fouled anchors with a crown. The rank of Petty Officer Second Class was abolished in 1907 and the rank simply being titled as Petty Officer from then, with the uniform and insignia formerly used by PO1s.
Grades
*
Petty officer third class
*
Petty officer second class
*
Petty officer first class
*
Chief petty officer
*
Senior chief petty officer
*
Master chief petty officer
A master chief petty officer is a senior non-commissioned officer in many navies and coast guards, usually above some grade of petty officer.
United States
Master chief petty officer (MCPO) is the ninth (just below the rank of MCPON) enliste ...
Usage in navies
Canada
There are two petty officer ranks in the
Royal Canadian Navy
The Royal Canadian Navy (RCN; , ''MRC'') is the Navy, naval force of Canada. The navy is one of three environmental commands within the Canadian Armed Forces. As of February 2024, the RCN operates 12 s, 12 s, 4 s, 4 s, 8 s, and several auxiliary ...
.
Petty officer, 2nd class (PO2) (''maître de deuxième classe'' or ''m2'' in
French) is equivalent to a
sergeant
Sergeant (Sgt) is a Military rank, rank in use by the armed forces of many countries. It is also a police rank in some police services. The alternative spelling, ''serjeant'', is used in The Rifles and in other units that draw their heritage f ...
and
petty officer, 1st class (PO1) (''maître de première classe'' or ''m1'') is equivalent to a
warrant officer
Warrant officer (WO) is a Military rank, rank or category of ranks in the armed forces of many countries. Depending on the country, service, or historical context, warrant officers are sometimes classified as the most junior of the commissioned ...
.
Petty officers are normally addressed as "Petty Officer Bloggins" or "PO Bloggins", thereafter as "PO". The "1st class" and "2nd class" designations are normally only used when such a distinction needs to be made, such as on a promotion parade or to distinguish two petty officers with similar names but different ranks. The NATO rank denotion for "petty officer, 2nd class" is OR-6 (petty officers, 2nd class with less than 3 years seniority are considered OR-5). The NATO rank denotion for "petty officer, 1st class" is OR-7.
India
A petty officer is a
non-commissioned officer
A non-commissioned officer (NCO) is an enlisted rank, enlisted leader, petty officer, or in some cases warrant officer, who does not hold a Commission (document), commission. Non-commissioned officers usually earn their position of authority b ...
in the
Indian Navy
The Indian Navy (IN) (ISO 15919, ISO: ) is the Navy, maritime and Amphibious warfare, amphibious branch of the Indian Armed Forces. The President of India is the Supreme Commander of the Indian Navy. The Chief of the Naval Staff (India), Chief ...
, equivalent to the
NATO
The North Atlantic Treaty Organization (NATO ; , OTAN), also called the North Atlantic Alliance, is an intergovernmental organization, intergovernmental Transnationalism, transnational military alliance of 32 Member states of NATO, member s ...
rank enlisted grade of
OR-6. They are equal in rank to a sub inspector of police in the Police, or
havildar in the
Indian Army
The Indian Army (IA) (ISO 15919, ISO: ) is the Land warfare, land-based branch and largest component of the Indian Armed Forces. The President of India is the Commander-in-Chief, Supreme Commander of the Indian Army, and its professional head ...
and
sergeant
Sergeant (Sgt) is a Military rank, rank in use by the armed forces of many countries. It is also a police rank in some police services. The alternative spelling, ''serjeant'', is used in The Rifles and in other units that draw their heritage f ...
in the
Indian Air Force
The Indian Air Force (IAF) (ISO 15919, ISO: ) is the air force, air arm of the Indian Armed Forces. Its primary mission is to secure Indian airspace and to conduct aerial warfare during armed conflicts. It was officially established on 8 Octob ...
. A petty officer is
superior in rank to a
leading rate and
subordinate
A hierarchy (from Greek: , from , 'president of sacred rites') is an arrangement of items (objects, names, values, categories, etc.) that are represented as being "above", "below", or "at the same level as" one another. Hierarchy is an importan ...
to a
chief petty officer, as is the case in the majority of Commonwealth navies.
A petty officer has the ability to work as a leader, capable of taking charge of a group of personnel, and taking roles in the training and recruitment of new members of the Indian Navy.
United Kingdom
In the
Royal Navy
The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...
, the rate of petty officer comes above that of
leading rating and below that of
chief petty officer. It is the equivalent of
sergeant
Sergeant (Sgt) is a Military rank, rank in use by the armed forces of many countries. It is also a police rank in some police services. The alternative spelling, ''serjeant'', is used in The Rifles and in other units that draw their heritage f ...
in the
Royal Marines
The Royal Marines provide the United Kingdom's amphibious warfare, amphibious special operations capable commando force, one of the :Fighting Arms of the Royal Navy, five fighting arms of the Royal Navy, a Company (military unit), company str ...
,
British Army
The British Army is the principal Army, land warfare force of the United Kingdom. the British Army comprises 73,847 regular full-time personnel, 4,127 Brigade of Gurkhas, Gurkhas, 25,742 Army Reserve (United Kingdom), volunteer reserve perso ...
and
Royal Air Force
The Royal Air Force (RAF) is the Air force, air and space force of the United Kingdom, British Overseas Territories and Crown Dependencies. It was formed towards the end of the World War I, First World War on 1 April 1918, on the merger of t ...
. Petty officer is the lowest of the
senior rating grades. Petty officers, like all senior rates, wear
"fore and aft" rig.
United States

The title of petty officer in the
United States Navy
The United States Navy (USN) is the naval warfare, maritime military branch, service branch of the United States Department of Defense. It is the world's most powerful navy with the largest Displacement (ship), displacement, at 4.5 millio ...
and
United States Coast Guard
The United States Coast Guard (USCG) is the maritime security, search and rescue, and Admiralty law, law enforcement military branch, service branch of the armed forces of the United States. It is one of the country's eight Uniformed services ...
has three separate "classes" (in order from junior to senior: 3rd class, 2nd class, 1st class) and three senior grades (chief petty officer, senior chief petty officer, master chief petty officer).
Petty officer, first class is equivalent in paygrade to
staff sergeant
Staff sergeant is a Military rank, rank of non-commissioned officer used in the armed forces of many countries. It is also a police rank in some police services.
History of title
In origin, certain senior sergeants were assigned to administr ...
in the United States Army and Marine Corps, and
technical sergeant
Technical sergeant is the name of three current and two former enlisted ranks in the United States Armed Forces, as well as in the U.S. Civil Air Patrol. Outside the United States, it is used only by the Philippine Army, Philippine Air Force, and ...
in the United States Air Force and United States Space Force.
Petty officer, second class is equivalent in paygrade to
sergeant
Sergeant (Sgt) is a Military rank, rank in use by the armed forces of many countries. It is also a police rank in some police services. The alternative spelling, ''serjeant'', is used in The Rifles and in other units that draw their heritage f ...
in the United States Army, Marine Corps, and Space Force, and
staff sergeant
Staff sergeant is a Military rank, rank of non-commissioned officer used in the armed forces of many countries. It is also a police rank in some police services.
History of title
In origin, certain senior sergeants were assigned to administr ...
in the United States Air Force.
Petty officer, third class is equivalent in paygrade to
corporal
Corporal is a military rank in use by the armed forces of many countries. It is also a police rank in some police services. The rank is usually the lowest ranking non-commissioned officer. In some militaries, the rank of corporal nominally corr ...
in the
United States Army
The United States Army (USA) is the primary Land warfare, land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of th ...
, corporal in the
United States Marine Corps
The United States Marine Corps (USMC), also referred to as the United States Marines or simply the Marines, is the maritime land force service branch of the United States Department of Defense. It is responsible for conducting expeditionar ...
,
senior airman in the
United States Air Force
The United States Air Force (USAF) is the Air force, air service branch of the United States Department of Defense. It is one of the six United States Armed Forces and one of the eight uniformed services of the United States. Tracing its ori ...
, and
specialist 4 in the
United States Space Force
The United States Space Force (USSF) is the space force branch of the United States Department of Defense. It is one of the six United States Armed Forces, armed forces of the United States and one of the eight uniformed services of the Unite ...
.
In the Navy, Petty Officer, Third Class is the juniormost of the Non-Commissioned Officer ranks, and thus a sailor must demonstrate satisfactory performance in the previous rank (E-3) in the form of a favorable performance review(s) by his/her superiors, and the passing of an exam, in order to be promoted to PO3.
Enlisted rank has two components: rate (pay grade) and rating (job specialty). Both components are reflected in the title. A sailor in the rate of petty officer first class with a rating of Aviation Machinist's Mate, would be an Aviation Machinist's Mate 1st Class (abbreviated "AD1"). In the Navy, it is acceptable to refer to a Petty Officer as such, while in the Coast Guard, rating is always used.
Gallery
File:British Royal Navy OR-6.svg, Petty officer
( Antigua and Barbuda Coast Guard)
File:Royal Australian Navy OR-6.svg, Petty officer
(Royal Australian Navy
The Royal Australian Navy (RAN) is the navy, naval branch of the Australian Defence Force (ADF). The professional head of the RAN is Chief of Navy (Australia), Chief of Navy (CN) Vice admiral (Australia), Vice Admiral Mark Hammond (admiral), Ma ...
)
File:Bahamas-Navy-OR-6.svg, Petty officer
( Royal Bahamas Defence Force)
File:02.BNF-PO.svg,
( Bangladesh Navy)
File:Barbados Coast Guard OR6.png, Petty officer
( Barbados Coast Guard)
File:British Royal Navy OR-6.svg, Petty officer
( Republic of Fiji Navy)
File:blank.svg, Petty officer
( Guyana Coast Guard)
File:PO Indian Navy.svg, Petty officer
(Indian Navy
The Indian Navy (IN) (ISO 15919, ISO: ) is the Navy, maritime and Amphibious warfare, amphibious branch of the Indian Armed Forces. The President of India is the Supreme Commander of the Indian Navy. The Chief of the Naval Staff (India), Chief ...
)
File:Ireland-Navy-OR-4.svg, Petty officer
( Irish Naval Service)
File:Jamaica-Navy-OR-6.svg, Petty officer
( Jamaican Coast Guard)
File:03-Namibia Navy-PO.svg, Petty officer
( Namibian Navy)
File:RNZN OR-6.svg, Petty officer
(Royal New Zealand Navy
The Royal New Zealand Navy (RNZN; ) is the maritime arm of the New Zealand Defence Force. The fleet currently consists of eight ships. The Navy had its origins in the Naval Defence Act 1913, and the subsequent acquisition of the cruiser , whi ...
)
File:blank.svg, Petty officer
( Nigerian Navy)
File:PNG_Maritime_OR-6.svg, Petty officer
( Papua New Guinea Maritime Element)
File:SAN-Navy-OR-6.svg, Petty officer
( South African Navy)
File:Sri_Lanka-Navy-OR-6.svg, Petty officer
(Sri Lanka Navy
The Sri Lanka Navy (SLN) (; ) is the navy, naval arm of the Sri Lanka Armed Forces and is classed as the country's most vital defence force due to its island geography. It is responsible for the maritime defence of the Sri Lankan nation and its ...
)
File:Trinidad & Tobago-Navy-OR-6.svg, Petty officer
( Trinidad and Tobago Coast Guard)
File:British Royal Navy OR-6.svg, Petty officer
(Royal Navy
The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...
)
See also
*
Boatswain's mate (disambiguation)
*
List of United States Navy ratings
United States Navy ratings are general enlisted occupations used by the U.S. Navy since the 18th century, which denote the specific skills and abilities of the sailor. Each naval rating has its own specialty badge, which is worn on the left s ...
*
Royal Navy ratings rank insignia
Royal may refer to:
People
* Royal (name), a list of people with either the surname or given name
* A member of a royal family or royalty
Places United States
* Royal, Arkansas, an unincorporated community
* Royal, Illinois, a village
* Ro ...
*
United States Navy enlisted rates
References
{{Authority control
Military ranks of the Commonwealth
Military ranks of Australia
Military ranks of Canada
Military ranks of the Royal Navy
Military ranks of the United States Navy
Naval ranks
Marine occupations