Fleet Admiral

Fleet Admiral is the highest attainable rank in many militaries, most notably Earth Starfleet and its Federation counterpart. One Fleet Admiral at a time is given the title Commander in Chief.

In 2254, while examining damage to Project Pharos, Dermot Cusack remarked "That's disruptor work, or I'm a fleet admiral", which Number One agreed with, but considered Cusack holding the rank a "ghastly notion".

Federation Starfleet

 * Harry Morrow, Commander Starfleet
 * Cartwright, Commander Starfleet
 * Robert Bennett, Commander Starfleet
 * William Smillie, Starfleet Commander-in-Chief
 * Margaret Sinclair-Alexander, Starfleet Commander-in-Chief
 * Edward Jellico, Starfleet Commander-in-Chief
 * Leonard James Akaar, Starfleet Commander-in-Chief
 * Jean-Luc Picard (War of the Prophets timeline)
 * Alynna Nechayev
 * Taela Shanthi
 * Karis Tatenen

Klingon Empire

 * Krell

Chronology
Dates listed are first appearence or mention at that rank except as noted.

2311

 * Fleet Admiral Margaret Sinclair-Alexander is Commander-in-Chief of Starfleet

2381

 * Fleet Admiral Edward Jellico is made Commander-in-Chief of Starfleet