Admiral
Admiral was a flag officer rank above vice admiral but below fleet admiral, the equivalent of which was used by the service organizations including Earth's Royal Navy, as well as in Starfleet ranks and Romulan ranks. (, et al.) The Cardassian Union's rank of legate was comparable to an admiral. ()

Admirals by grade

Federation Starfleet 
Prime universe
 Brett Anderson
 Robert April
 
 Bullock 
 
 
 
 
 
 
 
 Owen Paris
 Jean-Luc Picard
 
 
 
 
 
 Terral
 T'Lara
 Charlie Whatley

Alternate reality
 

Alternate future timelines
 William T. Riker

Royal Navy 
 Horatio Nelson

Romulan military 
 Alidar Jarok
 Mendak
 Valdore

Terran Empire Starfleet
 ''

Admirals by title

United Earth Starfleet 
 
 Gardner

Federation Starfleet 
Prime universe
 
 Robert April
 Jonathan Archer
 Richard B. Barnett
 
 Budrow
 
  
 Drazman
 Erma Felna
 
 Gilhouly
 Gupta
 Gurdy
 Hahn 
 Hastur
 Mark Jameson
 Edward Jellico
 J.R. Jennings 
 Gerald Kawaoki
 James Komack
 MacIntyre
 Marcia Meldal-Johnsan
 
 Mitsuya
 Kurt Nelson
 Nimembeh
 Ngomo 
 Nogura
 Nsomeka
 Gregory Quinn
 Raner
 Savar
 
 Kathryn Trimble 
 Veta
 Westervliet 
  

Alternate reality
 
 Richard Barnett
 Nensi Chandra
 
 Gretchen Lui

Alternate future timeline
 
 Brettner (holodeck simulation)

Appendices

See also 
 Starfleet flag officers

Background information 
TNG Season 1 introduced three unique, seemingly sequential, yet undefined admiral insignia designs that appeared in , , , and in archive footage from the aforementioned in . 

All of the admirals seen wearing this style of insignia (Savar, Aaron, Quinn, and Jameson) were only referred to by their "admiral" title, with Quinn being described as a "senior admiral", despite of having the lowest apparent grade insignia.

Following the first season, Robert Blackman's production notes during described this rank as "4 Starfleet Admiral, gold framed bar w/4 dots." 

The  labeled this rank as "admiral" referring to the , and "admiral, four star" referring to its use on , , and .

, mistakenly identified the late 2270's-2350's rear admiral insignia as the admiral insignia.

External links 
 
 

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Military ranks