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Flag commissioned officers
	Armies, air forces (non-Commonwealth)	Navies, coast guards	Air forces (Commonwealth system)
	Field marshal or Marshal or Captain general	Admiral of the fleet	Marshal of the air force
	General or colonel general or army general	Admiral	Air chief marshal
	Lieutenant general or army corps general	Vice admiral	Air marshal
	Major general or divisional general	Rear admiral or Counter admiral	Air vice-marshal
	Brigadier or brigadier general	Commodore or flotilla admiral	Air commodore
Senior commissioned officers
	Colonel	(Ship-of-the-line) Captain	Group captain
	Lieutenant colonel	Frigate captain or Commander	Wing commander
	Major or commandant	Corvette captain or Lieutenant commander	Squadron leader
Junior commissioned officers
	Captain	Lieutenant	Flight lieutenant
	First lieutenant or lieutenant	Lieutenant junior grade or sub-lieutenant	Flying officer
	Second lieutenant or junior lieutenant	Ensign or midshipman	Pilot officer
	Officer cadet	Officer cadet	Flight cadet
Non-commissioned officers
	Warrant officer or sergeant major	Warrant officer or chief petty officer	Warrant officer
	Sergeant	Petty officer	Sergeant
Enlisted ranks
	Corporal or bombardier	Leading seaman	Corporal
	Lance corporal or Lance bombardier or Specialist	Able seaman	Leading aircraftman or Air specialist
	Private or gunner or trooper or sapper	Seaman	Aircraftman or airman or aviator

Naval officer ranks
Flag officers
Admiral of the fleet Grand admiral Admiral General admiral Vice admiral Squadron admiral Lieutenant admiral Rear admiral Admiral-superintendent Port admiral Counter admiral Divisional admiral Commodore Flotilla admiral Schout-bij-nacht
Senior officers
Captain Captain at sea Captain of sea and war Flag captain Fleet captain Post-captain Ship-of-the-line captain Commander Frigate captain Corvette captain
Junior officers
Captain lieutenant Lieutenant commander Lieutenant Ship-of-the-line lieutenant Frigate lieutenant Lieutenant junior-grade Sub-lieutenant Corvette lieutenant Ensign Midshipman
v t e

An admiral of the fleet or shortened to fleet admiral is a senior naval flag officer rank, usually equivalent to Field marshal and Marshal of the air force. An admiral of the fleet is typically senior to an admiral.

It is also a generic term for a senior admiral in command of a large group of ships, comprising a fleet or, in some cases, a group of fleets. If actually a rank, its name can vary depending on the country. In addition to "fleet admiral" and "admiral of the fleet", such rank names include "admiral of the navy" and "grand admiral".