Rex
Rex may refer to:
- Rex (title) (Latin: king, ruler, monarch), a royal title
- King of Rome (Latin: Rex Romae), chief magistrate of the Roman Kingdom
Animals
Dogs
- Rex (dog), once owned by Ronald Reagan
- Rex (search and rescue dog), a dog that received a 1945 Dickin Medal for bravery
Other animals
- -rex, a taxonomic suffix used to describe certain large animals