(covers information from several alternate timelines)
|United States Navy, 1980s|
|Starfleet, 22nd century|
|Starfleet, 2250s - 2260s|
|Starfleet, Mid 2260s - Mid 2270s|
|Starfleet, Late 2270s - 2350s|
|Starfleet, 2350s -|
|Starfleet (provisional), 2370s|
|Alternate Lieutenant insignia|
|Terran Starfleet, 22nd century|
|Starfleet, 2250s (alternate reality)|
|Starfleet, 2370 (alternate timeline)|
|Starfleet, 29th century|
Lieutenant (typically pronounced as "loo-tenant" or "lef-tenant" in British English) is a military rank, the equivalent of which is used by the service organizations of many civilizations. As a traditional naval rank, lieutenant is the grade between ensign and lieutenant commander. In infantry, lieutenant is the lowest officer grade, falling below captain. An infantry lieutenant commands a platoon, consisting of about thirty troops.
In the Starfleet, the rank of lieutenant was directly between ensign and commander. The Federation Starfleet used additional grades in this transition, lieutenant junior grade, lieutenant, and lieutenant commander. This was identical to the system used by many older Earth agencies. Starfleet lieutenants were expected to be effective small-section leaders and technical experts, developing their leadership skills in preparation for promotion to the commander tier.
In the Romulan Star Empire, there exists a lieutenant grade and also a lower grade, sublieutenant. In the old Earth British Royal Navy, the rank sublieutenant is equivalent to Lieutenant, Junior Grade.
This grade presumably exists in some form in many other cultures' rank arrangements.
The New Sydney police bureau also used the rank. Fuchida was a lieutenant in 2375. (DS9: "Prodigal Daughter") Additionally, the New York City Police Department used the rank of lieutenant. Gary Seven had identification stating he was a lieutenant in the NYPD when he was sent to Earth in 1968. (TOS: "Assignment: Earth")
- Ghrath (Nazi Obersturmführer)
- McMillan (NASA)
- Paltani (Takret Militia lieutenant)
- Tarah (Imperial Guard lieutenant)
- Turanj (Hirogen posing as Nazi Untersturmführer)
- Unnamed USMC first lieutenant (United States armed forces personnel)
- Unnamed Nazi Untersturmführer (Nazi personnel)
- Unnamed Argosian lieutenant (DS9: "Dax")
Klingon Defense Force Edit
|Enlisted personnel||Commissioned officers||Generals and flag officers|
|ENS||LT JG||LT||LT CMDR||CMDR||CAPT||FCAPT||CDORE||RADM||VADM||ADM||FADM|
|2nd LT||1st LT||CAPT||MAJ||LT COL||COL||BRIG||MAJ GEN||LT GEN||GEN||MARSHAL|
|Positions:||Crewman • Technician • Chief||YMN||TAC • SO • 3rd • 2nd • 1st • CO • DD||Portmaster • Chief of Staff • CinC|
|Services:|| Andorian • Bajoran • Cardassian • Jem'Hadar • Klingon • Romulan • SS • Terran Empire Starfleet • Terran Empire MACO •|
United Earth MACO • United Earth/Federation Starfleet • United States • Vulcan