Rex may refer to one of the following:
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- , also known as , a 501st LegionClone Captain and Rebel Alliance member
- , an algorithm created by CloneCaptain Rex
- , formerly and nicknamed "", a pilot droid reprogrammed as a DJ at Black Spire Outpost
- , a Haxion Broodbounty hunter
- , an astronomical object in the Inner Rim
- , a squadled by Captain Rex
- , a platoon led by Captain Rex
- , an unnamed deceasedclone trooper buried in some of Captain Rex's armor
- Rex, also known as , a clone trooper captain in the 501st Legion
- Rex, a rakghoul observed by DoctorWylenn
- , leader of Suudaa Nem'ro's street gang
- , a holostar
- , a member of the Believers
- , or "", a Taung warrior
- RX-24, nicknamed "", a Star Tourspilot droid
- , a Jedi Knight of the Jedi Order