C. rex

C. rex may refer to:
 * Cattleya rex, an orchid species
 * Chrysiptera rex, a damselfish species from the Indo-West Pacific
 * Clytoceyx rex, the shovel-billed kookaburra or shovel-billed kingfisher, a large bird species endemic to New Guinea
 * Comitas rex, a sea snail species

Dinosaur Specimens
C. rex, the largest specimen of Tyrannosaurus rex