atopfourthwall: imadoctornotadragonslayer: The rank of Captain is generally held by the commanding officer of a starship. Captains may also serve as starbase commanders, the heads of experimental engineering teams, and head divisions of support personnel. All known (canon) women captains in Starfleet. Thanks to many contributors at Memory Alpha for the information, and TrekCore for the screencaps. While she eventually advanced to the rank of Admiral, there’s also Captain Elizabeth Shelby of the USS-Trident and then the Trident’s subsequent Captain Katerina Mueller… unless you’re not counting the books.