The Caldorians were a race presumably native to the Alpha or Beta Quadrants. They were distinguished by their facial hair and their claws, and a heavy coat of fur that made it difficult for Humans to distinguish their genders.

On Farius Prime in 2336, Commander Samir al-Halak and Lieutenant Anisar Batra encountered a dead or dying Caldorian suffering from the effects of red ice use. (TLE novel: Well of Souls)

The Caldorians most likely share a homeworld with the Caldorian eel, an animal first mentioned in TNG episode: "Unification, Part I".