[1] Vice Admiral Affiliation UNSC Navy Higher Rank Admiral Lower Rank Rear Admiral (Upper Half) Command Numbered Fleets Known Vice Admirals Alexander Reaves Michael Stanforth Preston Cole Kopano N'Singile Ysionris Jeromi Margaret Parangosky Danforth Whitcomb Jean Mawikizi Gerov

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Vice Admiral is a flag officer rank of the UNSC Navy, equivalent with the rank of Lieutenant General in the UNSC Marine Corps, UNSC Air Force, and UNSC Army. Vice Admirals generally command the numbered fleets around UNSC controlled space, and are in charge of the naval components of each of the regional unified commands. Of the five numbered fleets, four have command ships which act as the Vice Admiral's flagship.^{[verification needed]}

In informal settings, Vice Admirals are typically referred to simply as "Admiral", but may be also referred to as a "three-star Admiral" to distinguish it from the other ranks of Admiral, so named for the three star rank insignia worn on the uniform.

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UNSC Defense Force commissioned officer ranks
	O-1	O-2	O-3	O-4	O-5	O-6	O-7	O-8	O-9	O-10	Special
Approximate insignia:
Air Force:	2nd Lt	1st Lt	Capt	Maj	Lt Col	Col	Brig Gen	Maj Gen	Lt Gen	Gen	GOAF
Army:	2LT	1LT	CPT	MAJ	LTC	COL	BG	MG	LTG	GEN	GA
Marine Corps:	2ndLt	1stLt	CPT	Maj	LtCol	Col	BGen	MajGen	LtGen	Gen
Navy:	ENS	LTJG	LT	LCDR	CDR	CAPT	RDML	RADM	VADM	ADM	FADM