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Second officer is a military title that was held by many spacefaring civilizations. Aboard Federation starships, the Starfleet second officer is third-in-line for command, and usually fills a department head role in the senior staff, generally holding the rank of commander or lieutenant commander.
- Lieutenant Commander Data (USS Enterprise-D, 2364–2371; USS Enterprise-E, 2372–2379)
- Ezri Dax (Deep Space 9, 2376–2380, as lieutenant; USS Aventine, 2380–2381, as lieutenant commander)
- Jadzia Dax (Deep Space 9, 2369-2371, as lieutenant)
- Miranda Kadohata (USS Enterprise-E, from 2380, as lieutenant commander/commander)
- Xintal Linojj: USS Enterprise-B - (2311-?) (as Lieutenant commander)
- Spock: USS Enterprise - (2253-2264) (as Lieutenant); USS Enterprise - (2273) (as Commander)
- Montgomery Scott: USS Enterprise - (2266-2285) (as Lieutenant Commander/Commander); USS Enterprise-A - (2287-2293) (as Captain) (often deferred command duties to other ranking commanders aboard)
- Charles Tucker III: Enterprise (NX-01) - (2151-2155) (as Commander)
- Tuvok: USS Voyager - (2371-2377) (as Lieutenant/Lieutenant Commander); USS Titan - (2380- ) (as Commander)
- Worf: Deep Space 9 - (2372-2375) (as Lieutenant commander)