T. Rex, the main character of Dinosaur Comics

Tyrannosaurus rex, a large carnivorous dinosaur

T-Rex, a Marvel Comics character

T.Rex (band), a 1970s glam rock band originally known as Tyrannosaurus Rex

T-Rex Engineering, manufacturer of hand-made guitar effects pedals

T-Rex (automobile), a three wheeled vehicle combining a car and motorcycle

T-Rex (RC helicopter), a Popular RC helicopter made by Align Corp

T. Rex (A Celebration of Marc and Mickey), a tribute band for the above

The Adventures of T-Rex a television show from the early 1990s

Terex, a manufacturer of construction equipment

Thoristella rex, a species of Thoristella

T Rex (rifle) is a high powered hunting rifle that fires .577 rounds.

Tachyoryctes rex, the King Mole Rat

Tupelo T-Rex, a defunct ice hockey team

Trialeurodes rex, a species of whitefly, in the genus Trialeurodes

T-REX or Transportation Expansion Project (Denver), a Colorado Department of Transportation project to expand road and light rail capacity in metropolitan Denver, Colorado, between 2001 and 2006.