Senior Lieutenant signified a rank for junior officers in the Galactic Empire's starfleet. This position was superior to that of a Junior Lieutenant but inferior to a captain.
Prior to his advancement to captain and his eventual attainment of the rank of Grand Admiral, the Chiss officer Thrawn once held the rank of Senior Lieutenant. A number of officers serving on the Chimaera also possessed this rank, including Pyrondi, Lomar, and Xoxtin. This rank was also present within the Imperial Starfighter Coprs; Iden Versio held it briefly before the Battle of Yavin, as did Jeela Brebtin while serving with Squadron Five of the Empire's 204th Imperial Fighter Wing.