Captain is a high-ranking military position within the Galactic Federation. Usually, captains are within the jurisdiction of the Federation Police Force or the Galactic Federation Marine Corps.

Captain Dare was the first depicted Federation Police officer, seen in the Captain N: The Game Master comic Breakout. Also in Captain N, the title character is the leader of the N-Team, an assembly of original characters and those from video games, which included Samus Aran in the comics. Captain Jack, mentioned only in Blood of the Chozo, was a merchant that sold holo-cards and advised against buying them from Earth. Also in Blood of the Chozo, Captain Thea Aran was named as having been killed along with Chief Engineer Avram Aran, these two eventually evolved into Chief Rodney Aran and Virginia Aran, the parents of Samus Aran. Thea's rank was unknown, as Virginia was not seen to be involved in any military activities, apart from, possibly, the Afloraltite mining operations on K-2L. Captain A.C. Exeter, the only captain to appear in official Metroid canon, was the leader of the GFMC Task Force Herakles and killed prior to Metroid Prime 2: Echoes.