Ensign Affiliation UNSC Navy Higher Rank Lieutenant, Junior Grade Lower Rank Warrant Officer Known Ensigns Ellen Dowski William Lovell W. Handford Alexis Indara Otto Seinmann

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Ensign is a junior Commissioned officer rank of the UNSC Navy. It is the lowest commissioned officer rank, and is equal in rank to Second Lieutenant in the UNSC Marine Corps, UNSC Air Force, and the UNSC Army. It is the entry-level rank for Navy officers.

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