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Lieutenant junior grade often abbreviated to Lieutenant (j.g.), or junior lieutenant is a military rank, the equivalent of which is used by the service organizations of many civilizations. A naval rank in a small number of Earth's ancient navies (such as the US Navy), it is placed between [[Ensign]] and full [[Lieutenant]]. The rank is used primarily by Starfleet, although its United Earth predecessor, from which it primarily takes its rank structure, did not seem to have had this grade.
[[File:R-o2.png|right|thumb|Lieutenant (j.g.)]]
During certain points in its history, Starfleet discontinued the rank of Lieutenant junior grade, promoting [[Ensign]]s directly to the full grade of [[Lieutenant]]. This was the case in the mid 2270s, when Ensigns adopted the sleeve insignia of the former Lieutenant jg rank.