Starfleet lieutenant commanders

Throughout the history of Starfleet, there have been many officers to hold the rank of lieutenant commander.
==Lieutenant commanders==
Name 	Post 	Position 	Division 	Dates 	Species 	Note
 	 	 	Sciences 	2375 	Bolian 	
Airiam 	 	Bridge officer 	Sciences 	2256-57 	Augmented Human 	KIA in 2257
Albert 	 	 	Operations 	2368 	Human 	
 	 	 	 	2374 	 	MIA in 2374
Argyle 	 	chief engineer 	Operations 	2364 	Human 	
 	 	 	 	2364 	 	
 	 	 	 	2372 	 	
 	 	 	 	2364 	 	
 	 	 	 	2369 	 	
 	 	 	 	2372 	 	
Cavit 	 	executive officer 	Command 	2371 	Human 	KIA in 2371
 	 	First Officer 	Command 	2254-2259	Illyrian 	
 	 	 	 	2364 	 	
 	 	 	Command 	2354 	Human 	KIA in 2354
 	 	Chief medical officer 	Sciences 	2256 	Human 	
 	 	 	 	2369 	 	
 	Starbase 218 	Head of stellar sciences department 	Sciences 	2369 	Human 	
Data 	 	operations officerexecutive officer 	OperationsCommand division 	2360-2379	Soong-type android 	KIA in 2379
 	Deep Space 9 	chief science officer 	Sciences 	2372-2374	Trill (joined) 	KIA in 2374
 	Federation Medical Collection Station 	Medical trustee 	Sciences 	2365 	Human 	
 	 	 	 	2372 	 	
 	 	 	 	2364 	 	
 	Starbase 153Starbase 129 	 	 	2374 	 	KIA in 2374
 	 	 	 	2364 	 	
 	 	 	 	2369 	 	
 	Deep Space 9 	security chief 	Operations 	2371-2372	Human 	Defected to the Maquis in 2372
 	 	records officer 	Command 	2267 	Human 	
 	 	 	 	2369 	 	
Giotto 	 	security chief 	Operations 	2267 	Human 	
 	Starfleet Academy 	 	 	2285 	 	
 	Starfleet Academy 	Instructor 	 	2285 	 	
 	 	executive officer 	Command 	2368 	Human 	
 	 	 	 	2364 	 	
 	 	 	 	2374 	 	MIA in 2374
 	 	 	 	2374 	Human 	
 	Demilitarized Zone 	Attaché to the Demilitarized Zone 	Command 	2370 	Human 	Defected to the Maquis in 2370
 	 	 	 	2369 	 	
 	 	 	 	2364 	 	
 	 	chief engineer 	Operations 	2366-2379	Human 	
 	 	tactical officer 	CommandThis officer wore a different division color than indicated by their apparent position. 	2267 	Human 	KIA in 2267
 	 	 	 	2364 	 	
 	 	 	 	2367 	Human 	
 	 	 	 	2374 	 	KIA in 2374
 	 	 	 	2374 	 	
Lojur 	 	Helmsman 	Operations 	2293 	Human 	
 	Starfleet Academy 	Instructor 	 	2285 	 	
 	 	engineer 	Operations 	2364 	Human 	
MacDougal	 	chief engineer 	Operations 	2364 	Human 	
 	 	commanding officer 	Command 	2269 	Human 	
 	Capella IV 	chief medical officer 	Sciences 	2266-2269	Human 	Promoted to commander in 2269
 	 	 	 	2370s 	 	KIA prior to 2377
 	 	Planetary Geosciences Division 	 	2374 	 	
 	 	navigator 	Operations 	2265 	Human 	KIA in 2265
 	 	 	 	2374 	 	KIA in 2374
 	 	 	 	2364 	 	
 	 	astrobiologist 	Operations 	2268 	Human 	
Nambue 	 	Chief medical officer 	Sciences 	2256 	Human 	
 	 	 	 	2369 	 	
Piersall 	 	 	Command 	2370 	Human 	
 	 	 	 	2374 	 	
 	Office of the Inspector GeneralStarfleet Command	 	Command 	2364 	Human 	
 	 	executive officer 	Command 	2361-2364	Human 	Promoted to commander in 2364
 	Galen IV 	 	Command 	2353 	Human 	KIA in 2353
Saru 	 	Chief science officer 	Sciences 	2256 	Kelpien 	Promoted to commander in 2256
 	 	 	 	2160s 	Human 	Resigned in the mid-2160s
 	 	chief engineer 	Operations 	2266-2269	Human 	Promoted to commander in 2269
 	Starfleet Command 	 	Command 	2366-2367	Human 	Promoted to commander in 2367
 	Utopia Planitia Fleet Yards 	Executive officerYard engineer 	Command 	2366-2369	Human 	Promoted to commander in 2369
Sofak 	Starfleet Academy 	 	 	2285 	 	
Spock 	 	chief science officer 	Sciences 	2266-2267	Vulcan-Human hybrid 	Promoted to commander in 2267
 	 	Chief engineer 	Sciences 	2257 	Human 	
 	 	helmsman 	Operations 	2270s 	Human 	Promoted to commander by 2285
 	 	 	 	2369 	 	
Syvar 	 	 	Sciences 	2371 	Vulcan 	
 	 	 	 	2364 	 	
 	 	counselor 	Sciences 	2364-2370	Human-Betazoid hybrid	Promoted to commander in 2370
 	 	 	 	2369 	 	
Tuvok 	 	security chief 	Operations 	2374-2378	Vulcan 	
 	 	communications officer 	Operations 	2270s 	Human 	Promoted to commander by 2285
 	 	chief science officer 	Sciences 	2293 	Human 	
 	Deep Space 9 	science officer 	SciencesThis character was unseen in this position, and the division is assumed from their position.	2375 	Human 	KIA in 2375
 	 	 	 	2364 	 	
 	 	Second officer 	 	2365 	 	KIA in 2365
Worf 	Deep Space 9 	security chiefstrategic operations officerfirst officer	OperationsCommand 	2371-2379	Klingon 	
 	 	 	 	2369 	 	
 	 	 	 	2370s 	 	KIA prior to 2377
===Illusory lieutenant commanders===
Name	Post	Position 	Division 	Dates	Species 	Note
Worf	 	operations officer	Operations	2383 	Holographic representation of a Klingon	
===Alternate or parallel lieutenant commanders ===
Name 	Post	Position 	Division 	Dates 	Species 	Note
Icheb	 	 	Command 	2394 	Brunali 	
 	 	First officer 	Command division	2233 	
Human 	KIA in 2233
 	 	Chief medical officer	Sciences 	2258 	Human 	
 	 	chief medical officer	Sciences 	
2267 	 	
 	 	 	Command 	2378-2379	Human 	
 	 	Chief engineer 	Operations 	2258 	Human 	
 	 	chief engineer 	Operations 	
2267 	 	
 	 	chief science officer	Sciences 	2155 	Vulcan 	
Yor 	 	Time soldier 	Operations 	2379 	Betelgeusian	
===Other lieutenant commanders===
Name 	Post	Position 	Division 	Dates	Species 	Note
Jason Hayek	 	 	Command 	2374 	Alias of a Human	Possible Costuming Error: Wore provisional lt. cmdr. pip
 	 	 	 	2374 	Human 	Known to hold the rank of admiral
 	 	 	 	2374 	Human 	Known to hold the rank of vice admiral
Nog 	 	
chief engineer 	Operations	2374 	Ferengi 	Field promotion
 	 	 	 	2374 	Human 	Known to hold the rank of admiral
 	 	communications officer	Operations	2293 	Human 	Costuming Error: lieutenant junior grade
Sonak 	 	chief science officer 	Sciences 	2270s	Vulcan 	Seen as "Commander" referred to in Credits as Lt. Cmdr.
Tuvok 	 	security chief 	Operations	2371 	Vulcan 	Costuming Error: lieutenant
Valeris 	 	helmsman 	Sciences 	2293 	Vulcan 	Possible Costuming Error: lieutenant
===Gallery of unnamed lieutenant commanders ===
In addition, there was at least one more female lieutenant commander aboard the .
File:Starbase 11 patron 5.jpg|Starbase 11 officer, 2267
File:Starbase 11 patron 9.jpg|Starbase 11 officer, 2267
File:Leslie in command.jpg|USS Enterprise navigator, 2267
File:USS Enterprise command lieutenant commander 1.jpg|USS Enterprise senior staff member, 2268
File:Arkenite.jpg|Starfleet Command officer, 2286
File:Enterprise-B navigator.jpg|USS Enterprise-B officer, 2293
File:Enterprise-D lieutenant commander, 2364.jpg|USS Enterprise-D officer, 2364
File:Voyager chief medical officer.jpg|USS Voyager Chief medical officer, 2371
File:Human DS9 lieutenant commander, 2372.jpg|Deep Space 9 officer, 2372
File:Odyssey first officer.jpg|USS Odyssey officer, 2370
===Footnotes===
==Background information==
Numerous officers were referred to as commanders, or wore commander rank insignia, but were actually other ranks. In , Jean-Luc Picard remembered meeting Lieutenant Commander Riker, but Riker was wearing commander's insignia in the corresponding scene in . This happened in 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 's entire run.
Lieutenant commander