A five-star rank is a very senior military rank, particularly the United States rank of a general or admiral whose insignia is five stars  and corresponding ranks in other countries. The rank is that of the most senior operational military commanders, and within NATO's "standard rank scale" it is designated by the code OF-10.
Not all armed forces have such a rank, and in those that do the actual insignia of the "five-star ranks" may not contain five stars. For example: the insignia for the French OF-10 rank maréchal de France contains 7 stars; the insignia for the Portuguese marechal contains four gold stars; and many of the insignia of the ranks in Commonwealth of Nations contain no stars at all. Even within the United States, the insignia of this rank has not always included five stars.
Typically, five-star officers hold the rank of General of the Army, admiral of the fleet, field marshal, marshal of the air force, general of the Air Force, and several other similarly named ranks. Five-star ranks are extremely senior - usually the highest ranks. As an active rank, the position exists only in a minority of countries and is usually held by only a very few officers during wartime. In times of peace, it is usually held only as a ceremonial rank.
Despite the rarity and seniority of five-star officers, the leadership of some countries have felt the requirement to propose, and in some cases to adopt, even more senior ranks such as generalissimo, generalissimus, reichsmarschall, first marshal of the empire, admiral of the navy, General of the Armies, etc. These ranks are summarized in the six-star rank and highest military ranks articles.
Australian five-star ranks
Only one Australian born officer (Sir Thomas Blamey) has held a substantive Australian five-star rank (field marshal).[nb 2] HM King George VI and HRH Prince Philip, Duke of Edinburgh have held all three Australian five-star ranks in an honorary capacity, and have been the only holders of the Australian ranks of admiral of the fleet and marshal of the RAAF.
Croatian five-star ranks
- Stožerni general (lit. "staff general", usually translated as general of the army) awarded to six men, none of whom are in active duty.
- Admiral flote (admiral of the fleet). The rank was called stožerni admiral (lit. "staff admiral") until 1999; only Sveto Letica was awarded this rank – in March 1996, three months before his retirement.
Indian five-star ranks
- Admiral of the fleet, never been awarded
- Field marshal, awarded to Kodandera Madappa Cariappa and Sam Manekshaw
- Marshal of the Indian Air Force, awarded to Arjan Singh
Around 1998, the Indian Air Force introduced gorget patches (or collar tabs) for its air officers. For marshals of the Indian Air Force (to date only Arjan Singh has attained this rank), the patches display five stars.
Indonesian five-star ranks
The Indonesian five start ranks are:
- Jenderal Besar (Grand General) - only ever held by three people
- Laksamana Besar (Admiral of the Fleet) - never awarded
- Marsekal Besar (Marshal of the Air Force) - never awarded
Italian five-star ranks
General of the Italian Army - shoulder board
Admiral of the Italian Navy - sleeve
General of the Italian Air Force - sleeve
Pakistani five-star ranks
The following ranks have never been awarded:
- Admiral of the fleet
- Marshal of the Pakistan Air Force
Polish five-star ranks
Marshal of Poland (Marszałek Polski) is a Polish Army five-star rank. There are today no living marshals of Poland, since this rank is bestowed only on military commanders who have achieved victory in war.
Spanish five-star ranks
These ranks have been reserved for the reigning monarch.
Capitán general de la armada ("captain general of the Spanish Navy")
shoulder board and sleeve
Capitán general del ejército del aire ("captain general of the Spanish Air Force")
shoulder board and sleeve
UK five-star ranks
The worn insignia of British five-star commanders do not contain stars, the vehicle star plate, mounted on the front of a staff car does display five stars.
- Admiral of the fleet (awarded to 121 men to date)
- Field marshal (awarded to 140 men to date)
- Marshal of the Royal Air Force (awarded to 27 men to date)
Promotion to the ranks of admiral of the fleet and marshal of the Royal Air Force is now generally held in abeyance in peacetime with exceptions for special circumstances. Promotion to the rank of field marshal was generally stopped in 1995 as a cost-cutting measure but is still made in some cases. The most recent appointments to five-star ranks are the promotions in 2012 of The Prince of Wales to honorary five-star rank in all three services, and of former Chief of the Defence Staff Lord Guthrie of Craigiebank to the honorary rank of field marshal. In 2014 the former Chief of the Defence Staff Lord Stirrup was promoted to the honorary rank of marshal of the RAF.
US five-star ranks
- Fleet admiral (held by four officers)
- General of the Army (held by five officers)
- General of the Air Force (held by one officer)
Five-star ranks were created in the US military during World War II because of the awkward situation created when some American senior commanders were placed in positions commanding allied officers of higher rank. US officers holding five-star rank never retire; they draw full active duty pay for life. The five-star ranks were retired in 1981 on the death of General Omar Bradley.
Nine Americans have been promoted to five-star rank, one of them, Henry H. Arnold, in two services. As part of the bicentennial celebration, George Washington was, 177 years after his death, permanently made senior to all other US generals/admirals, with the title General of the Armies, effective on 4 July 1976. The appointment stated he was to have "rank and precedence over all other grades of the Army, past or present".[nb 3]
- Ranks and insignia of NATO
- List of fleet and grand admirals
- List of field marshals
- List of marshals of the Air Force
- Design of US army insignia
- Heraldic origin of the use of five-pointed star
- The Australian insignia for admiral of the fleet, field marshal and marshal of the Royal Australian Air Force, depending on the era, are either identical to, or very similar to, the British insignia. Currently, Prince Philip is the only holder of these Australian ranks. Note that although the highest active New Zealand rank is three-star, (there are no New Zealand four-star rank holders), Prince Philip holds five-star ranks in the New Zealand Armed Forces.
- With the exception of Thomas Blamey and the Englishman William Birdwood, who both held the rank of field marshal, all other holders of Australian five-star ranks have been ceremonial.
- The following Americans have been promoted to five-star rank:
• Fleet Admiral William D. Leahy 15 December 1944 • General of the Army George Marshall 16 December 1944 • Fleet Admiral Ernest King 17 December 1944 • General of the Army Douglas MacArthur 18 December 1944 • Fleet Admiral Chester W. Nimitz 19 December 1944 • General of the Army Dwight D. Eisenhower 20 December 1944 • General of the Army & Air Force Henry H. Arnold 21 December 1944 & 7 May 1949 • Fleet Admiral William Halsey, Jr. 11 December 1945 • General of the Army Omar Bradley 20 September 1950 • General of the Armies George Washington 4 July 1976, with an effective appointment date of 4 July 1776a
The timing of the first seven appointments was to establish both a clear order of seniority and a near-equivalence between the Army and Navy services. In 1949, Arnold was honored by being made the first, and to date only, General of the Air Force. He is the only American to serve in a five-star rank in two of its military services.
By a Congressional Act of 24 March 1903, Admiral George Dewey's rank was established as Admiral of the Navy, a rank which was specified to be senior to the four-star rank of admiral and was equal to admiral of the fleet in the British Royal Navy. Admiral Dewey was the only individual ever appointed to this rank, which lapsed with his death on 16 January 1917. Admiral of the Navy was considered superior to fleet admiral during World War II.
On 3 September 1919, John Pershing was promoted to the rank of General of the Armies (officially General of the Armies of the United States) in recognition of his service during World War I. He is the only person promoted to this rank during their lifetime.
- ^a During the United States Bicentennial year, George Washington was posthumously appointed to the grade of General of the Armies of the United States by the congressional joint resolution Public Law 94-479 passed on 19 January 1976, with an effective appointment date of 4 July 1976 but having rank and precedence over all other grades of the Army, past or present. This restored Washington's position as the most senior US military officer. Between the joint resolution concerning Washington's rank, the fact that Omar Bradley was still alive, and thus still considered to be on active duty, and statements made and actions taken during and after World War II about the relationship between General of the Armies and General of the Army, it appears General of the Armies is superior in rank to General of the Army.
- Oxford English Dictionary (OED), 2nd Edition, 1989. "five" ... "five-star adj., ... (b) U.S., applied to a general or admiral whose badge of rank includes five stars;"
- Indian Air Force :: Collar Tabs
- Dictionary of Vexillology, Rank Plate
- Heathcote, Tony (1999). The British Field Marshals, 1736–1997: A Biographical Dictionary. Barnsley: Pen and Sword Books. ISBN 978-0-85052-696-7.
- "Prince Charles awarded highest military ranks by Queen". BBC News. 15 June 2012. Retrieved 17 June 2012.
- "Honorary Five Star Rank appointment". The British Monarchy. 16 June 2012. Retrieved 22 June 2012.
- "2014 Birthday Honours for service personnel and defence civilians". Ministry of Defence. 13 June 2014. Retrieved 22 June 2014.
- E. Kelly Taylor (2009). America's Army and the Language of Grunts: Understanding the Army Lingo Legacy. AuthorHouse. p. 283. ISBN 978-1-4389-6249-8.
- Spencer C. Tucker (2011). The Encyclopedia of the Vietnam War: A Political, Social, and Military History. ABC-CLIO. pp. 1685. ISBN 978-1-85109-961-0.