A senior officer is an officer of a more senior grade in military or other uniformed services. In military organisations, the term may refer to any officer above

junior officer Junior officer, company officer or company grade officer refers to the lowest operational commissioned officer category of ranks in a military or paramilitary organization, ranking above non-commissioned officers and below senior officers. Th ...

rank, but usually specifically refers to the middle-ranking group of

commissioned officer An officer is a person who holds a position of authority as a member of an armed force or uniformed service. Broadly speaking, "officer" means a commissioned officer, a non-commissioned officer, or a warrant officer. However, absent conte ...

s above junior officer ranks but below

flag A flag is a piece of fabric (most often rectangular or quadrilateral) with a distinctive design and colours. It is used as a symbol, a signalling device, or for decoration. The term ''flag'' is also used to refer to the graphic design emp ...

general A general officer is an officer of high rank in the armies, and in some nations' air forces, space forces, and marines or naval infantry. In some usages the term "general officer" refers to a rank above colonel."general, adj. and n.". O ...

air rank An air officer is an air force officer of the rank of air commodore or higher. Such officers may be termed "officers of air rank". While the term originated in the Royal Air Force, air officers are also to be found in many Commonwealth nations ...

. In most countries, this includes the

rank Rank is the relative position, value, worth, complexity, power, importance, authority, level, etc. of a person or object within a ranking, such as: Level or position in a hierarchical organization * Academic rank * Diplomatic rank * Hierarchy * H ...

s of

lieutenant commander Lieutenant commander (also hyphenated lieutenant-commander and abbreviated Lt Cdr, LtCdr. or LCDR) is a commissioned officer rank in many navies. The rank is superior to a lieutenant and subordinate to a commander. The corresponding rank i ...

/ major/

squadron leader Squadron leader (Sqn Ldr in the RAF ; SQNLDR in the RAAF and RNZAF; formerly sometimes S/L in all services) is a commissioned rank in the Royal Air Force and the air forces of many countries which have historical British influence. It is als ...

commander Commander (commonly abbreviated as Cmdr.) is a common naval officer rank. Commander is also used as a rank or title in other formal organizations, including several police forces. In several countries this naval rank is termed frigate captain ...

/ lieutenant colonel/

wing commander Wing commander (Wg Cdr in the RAF, the IAF, and the PAF, WGCDR in the RNZAF and RAAF, formerly sometimes W/C in all services) is a senior commissioned rank in the British Royal Air Force and air forces of many countries which have historic ...

and

naval captain Captain is the name most often given in English-speaking navies to the rank corresponding to command of the largest ships. The rank is equal to the army rank of colonel and air force rank of group captain. Equivalent ranks worldwide include ...

colonel Colonel (abbreviated as Col., Col or COL) is a senior military officer rank used in many countries. It is also used in some police forces and paramilitary organizations. In the 17th, 18th and 19th centuries, a colonel was typically in charge ...

group captain Group captain is a senior commissioned rank in the Royal Air Force, where it originated, as well as the air forces of many countries that have historical British influence. It is sometimes used as the English translation of an equivalent rank i ...

, or their equivalents. In some countries, it also includes

brigadier Brigadier is a military rank, the seniority of which depends on the country. In some countries, it is a senior rank above colonel, equivalent to a brigadier general or commodore, typically commanding a brigade of several thousand soldiers. In ...

s and

commodore Commodore may refer to: Ranks * Commodore (rank), a naval rank ** Commodore (Royal Navy), in the United Kingdom ** Commodore (United States) ** Commodore (Canada) ** Commodore (Finland) ** Commodore (Germany) or ''Kommodore'' * Air commodore, a ...

s. Sometimes, particularly in the army, this grade is referred to as field-grade officers, field officers or officers of field rank. Historically, a

regiment A regiment is a military unit. Its role and size varies markedly, depending on the country, service and/or a specialisation. In Medieval Europe, the term "regiment" denoted any large body of front-line soldiers, recruited or conscripted ...

battalion A battalion is a military unit, typically consisting of 300 to 1,200 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies (usually each commanded by a major or a captain). In some countries, battalions are ...

's field officers made up its command element.

Canada

In the

Canadian Armed Forces } The Canadian Armed Forces (CAF; french: Forces armées canadiennes, ''FAC'') are the unified military forces of Canada, including sea, land, and air elements referred to as the Royal Canadian Navy, Canadian Army, and Royal Canadian Air Force. ...

, the term "senior officer" (french: officier supérieur) is used in all three services. It includes the army and air force ranks of major,

lieutenant-colonel Lieutenant colonel ( , ) is a rank of commissioned officers in the armies, most marine forces and some air forces of the world, above a major and below a colonel. Several police forces in the United States use the rank of lieutenant colone ...

, and

, and the naval ranks of

lieutenant-commander Lieutenant commander (also hyphenated lieutenant-commander and abbreviated Lt Cdr, LtCdr. or LCDR) is a commissioned officer rank in many navies. The rank is superior to a lieutenant and subordinate to a commander. The corresponding rank i ...

, and

captain Captain is a title, an appellative for the commanding officer of a military unit; the supreme leader of a navy ship, merchant ship, aeroplane, spacecraft, or other vessel; or the commander of a port, fire or police department, election precinct, e ...

France

In the

French Armed Forces The French Armed Forces (french: Forces armées françaises) encompass the French Army, Army, the French Navy, Navy, the French Air and Space Force, Air and Space Force and the National Gendarmerie, Gendarmerie of the French Republic. The Preside ...

, senior officers are called ''officiers supérieurs''. They include the army and air force ranks of ''

commandant Commandant ( or ) is a title often given to the officer in charge of a military (or other uniformed service) training establishment or academy. This usage is common in English-speaking nations. In some countries it may be a military or police ran ...

'', ''

'' and ''

'', and the naval ranks of''

capitaine de corvette Corvette captain is a rank in many navies which theoretically corresponds to command of a corvette (small warship). The equivalent rank in the United Kingdom, Commonwealth, and United States is lieutenant commander. The Royal Canadian Navy use ...

'', ''

capitaine de frégate The rank insignia of the French Navy (french: Marine Nationale) are worn on shoulder straps of shirts and white jackets, and on sleeves for navy jackets and mantels. Until 2005, only commissioned officers had an anchor on their insignia, but enli ...

'' and ''

capitaine de vaisseau Captain is the name most often given in English-speaking navy, navies to the rank corresponding to command of the largest ships. The rank is equal to the army rank of colonel and air force rank of group captain. Equivalent ranks worldwide in ...

''.

Germany

In the German

Bundeswehr The ''Bundeswehr'' (, meaning literally: ''Federal Defence'') is the armed forces of the Federal Republic of Germany. The ''Bundeswehr'' is divided into a military part (armed forces or ''Streitkräfte'') and a civil part, the military part con ...

, officers of the rank of major,

oberstleutnant () is a senior field officer rank in several German-speaking and Scandinavian countries, equivalent to Lieutenant colonel. It is currently used by both the ground and air forces of Austria, Germany, Switzerland, Denmark, and Norway. The S ...

and

oberst ''Oberst'' () is a senior field officer rank in several German-speaking and Scandinavian countries, equivalent to colonel. It is currently used by both the ground and air forces of Austria, Germany, Switzerland, Denmark, and Norway. The Swe ...

in the Heer (army) and

Luftwaffe The ''Luftwaffe'' () was the aerial-warfare branch of the German '' Wehrmacht'' before and during World War II. Germany's military air arms during World War I, the '' Luftstreitkräfte'' of the Imperial Army and the '' Marine-Fliegerabt ...

(air force), and

Korvettenkapitän () is the lowest ranking senior officer in a number of Germanic-speaking navies. Austro-Hungary Belgium Germany Korvettenkapitän, short: KKpt/in lists: KK, () is the lowest senior officer rank () in the German Navy. Address The offi ...

fregattenkapitän Fregattenkapitän, short: FKpt / in lists: FK, () is the middle field officer rank () in the German Navy. Address In line with ZDv 10/8, the official manner of formally addressing military personnel holding the rank of ''Fregattenkapitän'' ( ...

and

kapitän zur see Captain is the name most often given in English-speaking navies to the rank corresponding to command of the largest ships. The rank is equal to the army rank of colonel and air force rank of group captain. Equivalent ranks worldwide include ...

in the

Deutsche Marine The German Navy (, ) is the navy of Germany and part of the unified ''Bundeswehr'' (Federal Defense), the German Armed Forces. The German Navy was originally known as the ''Bundesmarine'' (Federal Navy) from 1956 to 1995, when ''Deutsche Mari ...

(navy) are traditionally known as ''stabsoffiziere'' ( en, staff officers).

Russia

''Shtabofitser'' (Штаб-офицер), derived from the German ''stabsoffizier'', was the designation of the following officers of the

Russian Imperial Army The Imperial Russian Army (russian: Ру́сская импера́торская а́рмия, tr. ) was the armed land force of the Russian Empire, active from around 1721 to the Russian Revolution of 1917. In the early 1850s, the Russian A ...

and Navy until 1917.

United Kingdom and Commonwealth

The

British Army The British Army is the principal land warfare force of the United Kingdom, a part of the British Armed Forces along with the Royal Navy and the Royal Air Force. , the British Army comprises 79,380 regular full-time personnel, 4,090 Gur ...

and

Royal Marines The Corps of Royal Marines (RM), also known as the Royal Marines Commandos, are the UK's special operations capable commando force, amphibious light infantry and also one of the five fighting arms of the Royal Navy. The Corps of Royal Marine ...

use the terms "officers of field rank" or "field officers" to refer to the ranks of major,