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
See also Rex (disambiguation)