Tyrannosaurus rex is a species of dinosaur.

T. Rex or T-Rex may also refer to:

• Tachyoryctes rex, the king mole rat, a rodent species found high on Mount Kenya
• Thoristella rex, a sea snail species endemic to New Zealand
• Trialeurodes rex, a whitefly species found on Sulawesi
• Tropidoptera rex, a probably extinct snail species endemic to Oahu
• Tyrannasorus rex, a fossil beetle species from the Miocene epoch
• Tyrannobdella rex, a leech species found in South America
• Tyrannochthonius rex, a pseudoscorpion species found in Australia
• Tyrannomolpus rex, a leaf beetle species endemic to New Zealand
• Tyrannomyrmex rex, an ant species found in Southeast Asia

• T. Rex (band), a 1970s glam rock band (previously Tyrannosaurus Rex. a 1960s psychedelic folk duo) headed by Marc Bolan
• Mickey Finn's T-Rex, a tribute band to the 1970s glam rock band, formed by members of the original band
• X-T. Rex, formerly Bill Legend's T.Rex, another tribute band to the 1970s glam rock band, formed by Bill Legend, another member of the original band
• T.Rex Wax Company, record label owned by Marc Bolan which released his band's recordings from 1972 onwards

• T. Rex (album), a 1970 studio album by the 1970s band
• "T-Rex [Jurassic Park]", a song by Basshunter from The Old Shit album

• T-Rex, the main character of Dinosaur Comics
• The Adventures of T-Rex, an American animated television series
• Theodore Rex (film), starring Whoopi Goldberg
• T-Rex, a toy in Big & Small

• .577 T-Rex, .577 Tyrannosaur, a very large and powerful rifle cartridge developed for "stopping rifles" intended to stop the charge of dangerous game
• T-Rex Engineering, a guitar effect pedal manufacturer

• dmedia T-REX, a defunct Chinese Professional Baseball League team
• Tupelo T-Rex, a defunct American ice hockey team

• Bremach T-Rex, a multi-purpose truck manufactured in Italy
• Campagna T-Rex, a two-seat, three-wheeled vehicle manufactured in Canada
• Dodge T-Rex, a 6x6 concept vehicle
• T-Rex, a Ukrainian main battle tank in development

• T-Rex Cafe, a restaurant chain at Disney Springs in Lake Buena Vista, Florida
• T-REX (web server), developed at the Université du Québec à Montréal, Canada
• T-REX Project, a Colorado Department of Transportation project
• T-REx cell lines, a proprietary cell line system using tetracycline-controlled transcriptional activation

• Terex, a construction equipment manufacturer
• Trex (disambiguation)

This disambiguation page lists articles associated with the title T. rex.
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