A four-star rank is the rank of any four-star officer described by the NATO OF-9 code. Four-star officers are often the most senior commanders in the armed services, having ranks such as (full) admiral, (full) general, or air chief marshal. This designation is also used by some armed forces that are not North Atlantic Treaty Organisation (NATO) members.
- Admiral (Royal Australian Navy four-star rank)
- General (Australian Army four-star rank)
- Air chief marshal (Royal Australian Air Force four-star rank)
The four-star rank is reserved in Australia for the Chief of the Defence Force, the highest position in peace time.
- General de exército (Brazilian Army four-star rank)
- Almirante de esquadra (Brazilian Navy four-star rank)
- Tenente brigadeiro (Brazilian Air Force four-star rank)
The four-star rank is reserved in Brazil for the highest post in the military career. The officers in this position take part of the high command of their corporations. The commanders of army, navy and air force are also four-star generals, but they have precedence to all the others military in this rank.
- Admiral/amiral (Canadian Forces officers authorized to wear naval uniform four-star-equivalent rank)
- General/général (Canadian Forces officers authorized to wear army and air force uniform four-star-equivalent rank)
General/Admiral is the highest rank within the Canadian Armed Forces as defined within the National Defence Act. Usually, only one officer, the Chief of the Defence Staff, carries the rank of full admiral or general at any one time. However, the crown may authorize additional officers at that rank for special cases such as for Canadian officers in the position of Chairman of the NATO Military Committee, who are usually former Chiefs of the Defence Staff seconded to NATO for that duty.
The Queen of Canada, Elizabeth II, is Commander-in-Chief of the Canadian Armed Forces. However, in line with the Letters Patent, 1947, the duties and title of commander-in-chief are normally exercised by the Governor General of Canada. The Minister of National Defence, since not a member of the Canadian forces nor within the military chain-of-command, has no rank. Prince Philip holds the four-star rank of admiral in the Royal Canadian Navy in an honorary capacity as of 2011.
- Chairman Joint Chiefs of Staff committee General (Pakistan Army four-star rank) / Air chief marshal (Pakistan Air Force four-star rank)/ Admiral (Pakistan Navy four-star rank)
- General (Pakistan Army four-star rank)
- Air chief marshal (Pakistan Air Force four-star rank)
- Admiral (Pakistan Navy four-star rank)
- General (Indian Army four-star rank)
- Air chief marshal (Indian Air Force four-star rank)
- Admiral (Indian Navy four-star rank)
- Director of the Intelligence Bureau (Intelligence Bureau four-star rank)
- Admiral (Royal Navy four-star rank)
- General (British Army and Royal Marines four-star rank)
- Air chief marshal (Royal Air Force four-star rank)
- List of Royal Marines full generals
- List of British Army full generals
- List of Royal Air Force air chief marshals
- Admiral (United States Navy, Coast Guard, NOAA Corps, and Public Health Service Commissioned Corps four-star rank)
- General (United States Army, Air Force, and Marine Corps four-star rank)
- List of active duty United States four-star officers
- List of United States Navy four-star admirals
- List of United States Public Health Service Commissioned Corps four-star admirals
- List of United States Army four-star generals
- List of United States Air Force four-star generals
- List of United States Marine Corps four-star generals
Former USSR and Russia
- General armii (infantry and marines of the Red Army, Russian Army and Air Force four-star rank)
- Glavnii marshal and marshal (four-star equivalents of the Soviet Air Force, and of the other branches of the Red Army)
- Admiral flota (four star equivalent of the Soviet and the Russian Navies)
While the general armii wore shoulder insignia with four small stars, the marshal and admiral flota wore one single large star on their shoulder boards, and the glavnii marshal the same large star with a laurel wreath, very similar to the modern army general insignia of the Russian Army.
Upon their formation, the Russian armed forces discontinued the ranks of marshal and glavnii marshal.
- This rank insignia is not worn by all NATO officers.
- Canada - Department of Justice "Laws of Canada: National Defence Act, Schedule I"
- Lagassé, Philippe (December 2013). "The Crown's Powers of Command-in Chief: Interpreting Section 15 of Canada's Constitution Act, 1867" (PDF). Review of Constitutional Studies. 18 (2): 189–220.
- The Governor General, Commander-in-Chief ""
- RAF Glossary, "Air of Authority - A History of RAF Organisation", rafweb.org