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[[File:G-o2.png|right|thumb|1st Lieutenant]]

In the Starfleet Marine Corps, a First Lieutenant is a junior commissioned officer. It is just above the rank of [[Second Lieutenant]] and just below the rank of [[Marine Captain]]. It is equivalent to the rank of [[Lieutenant (j.g.)]] in the fleet services with a pay grade of O-2.

A [[Second Lieutenant]] (grade O-1) is usually promoted to First Lieutenant (grade O-2) after 18 months in the Corps. The difference between the two ranks is slight, primarily being experience and having higher pay. It is not uncommon to see officers moved to positions requiring more experience after promotion to First Lieutenant.  These positions can include leading a specialty platoon, or assignment as the executive officer for a company-sized unit (70-250 marines).