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Lieutenant is a commissioned rank of the Starfleet in the fictional universe of Star Trek.
Lieutenant is perhaps the most common rank to appear in the entire Star Trek series. Throughout nearly forty years of production, the rank of Lieutenant has been held by several major characters and dozens of extras. The rank can trace its origins to the original pilot episode "The Cage" where the Executive Officer of the USS Enterprise, the mysterious "Number One", holds the rank of Lieutenant along with a very young Lieutenant Spock.
Lieutenant was also common in Star Trek: The Original Series, held by the main characters of Lieutenants Uhura and Sulu as well as several guest star roles.
In Star Trek: The Motion Picture, the former Ensign Chekov is promoted to Lieutenant and Star Trek fans are introduced to the character of Lieutenant Ilia.
Subsequent to Star Trek: The Motion Picture, the rank of Lieutenant fell into disuse and there were only two characters to appear in the films holding the rank. The characters in question, however, Lieutenants Saavik and Valeris, wore differing rank insignia. The "Star Trek Encyclopedia" would later confirm that Saavik was a Lieutenant Junior Grade and Valeris a Lieutenant Commander[#endnote_1].
The first time that the feature film rank pin of Lieutenant was shown clearly on screen was not in a Star Trek film, but rather in an episode of [[Star Trek: The Next Generation]]. The character of Ian Troi appears in the episode "Dark Page" wearing the full Lieutenant rank pin. In the film [[Star Trek: Generations|Generations]], the rank pin is seen on the tactical officer. However, other than these times and a few quick shots from Star Trek III and VI, these are the only times that the movie era rank of Lieutenant is shown on camera.
Several characters of Star Trek: The Next Generation held the rank of Lieutenant to include Geordi La Forge, Ro Laren, and Lieutenant Worf. The spin-off television series of Star Trek: Deep Space Nine and Star Trek: Voyager also made heavy use of the rank of Lieutenant with Lieutenant Hawk appearing as a character in the Star Trek film [[Star Trek: First Contact]].
Lieutenant is also a rank held by a major character of [[Star Trek: Enterprise]], that being Lieutenant Malcolm Reed.
