Reptile Beast (爬獣; hajuu) is a family in the Battle Spirits trading card game.
It premiered in BS01. Its name can be translated literally into "crawling beasts". All Reptile Beasts are Red. They are based on reptiles, including some dinosaurs. The family has many low-cost spirits. It has remained a minor family throughout, with the only two support up to this point (start of True Rebirth Era) being The ReptileMaster Momochidile and Clash King Dan.