Starfleet commanders
In the history of Starfleet, there have been many officers holding the rank of commander.

Commanders

Illusory commanders

Alternate or parallel commanders

Other commanders

Gallery of unnamed commanders

Background information 

Numerous officers were often referred to as commanders, or wore commander's rank insignia, but were actually other ranks. In , Jean-Luc Picard remembers meeting Lieutenant Commander Riker, but Riker was wearing commander's insignia in the corresponding scene in . This happened in TOS also, as Spock was referred to as an lieutenant commander in  even though he regularly wore commander's stripes up to and including that point. The same went for Benjamin Finney in that episode and Giotto in , both of whom wore commander's insignia but were clearly referred to as lieutenant commander in dialogue. The reverse happened to Chakotay, who wore lieutenant commander's insignia but was only referred to as commander for VOY's entire run.

See also 
 Commander, Starfleet
 Theater Commander

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Commanders