Rear admiral

Rear admiral is a flag officer rank that is usually between a commodore and vice admiral.

During the 24th century, the Federation Starfleet depreciated the commodore grade, replacing it with rear admiral lower half.

Also, the Hydran rank of third admiral is roughly equivalent to the Starfleet rank of rear admiral (upper half). (RIS Bouteina: "Hilbert Hotel")

The Lyran Starfleet rank of senior commodore is roughly equivalent to rear admiral (upper half). (Star Trek: The Stoneship Files)

Starfleet insignia

Rear admiral lower half

2350s-2360s	2360s-2370s service uniform	2360s-2370s duty uniform	2370s-2380s

Early 2380s	Mid 2380s	2390s
File:RDML (early 2380s).png File:Red (early 2380s).png	File:RDML (mid 2380s).png File:Red (mid 2380s).png	File:RDML (2390s).png File:Red (2390s).png

Alternate realities

2380s-2400s	2390s	29th century

Rear admiral upper half

22nd century	2230s

2250s	2260s-2270s	Early 2270s (Shoulders/Sleeves)	Late 2270s-2350s (Shoulders/Sleeves)

2350s-2360s	2360s-2370s service uniform	2360s-2370s duty uniform	2370s-2380s

Early 2380s	Mid 2380s	2390s
File:RADM (early 2380s).png File:Red (early 2380s).png	File:RADM (mid 2380s).png File:Red (mid 2380s).png	File:RADM (2390s).png File:Red (2390s).png

Alternate realities

2250s	2380s-2400s	2390s	29th century

Other insignia

Klingon Navy 23rd century

		Enlisted ranks					Etc	Officer ranks						Flag ranks
Starfleet Officers Enlisted Misc.		CR CA CN	PO3 PO2 PO1	CPO	SCPO	MCPO CMCPO FMCPO MCPOSF	WO CDT MID REC	ENS	LTJG	LT	LCDR	CDR	CAPT FCAPT	CDRE RDML RADM		VADM	ADM	FADM
Kai Imperium		TRN MNX IMUN	LGN3 LGN2 LGN1	CLGN	CEN	SCEN		PVT	PRN		OP	TRB VIC	PR	PTR		MST	LEG	IMP

External links

• Rear admiral article at Memory Alpha, the canon Star Trek wiki.
• Rear admiral article at Memory Beta, the non-canon Star Trek wiki.