| Named By: | Cope in 1882 |
| Time Period: | 299-251 Ma Early to Late Permian |
| Location: | USA, Texas |
| Size: | 1 meter long |
| Diet: | unavailable |
| Fossil(s): | Several Specimens |
| Classification: | | Chordata | Amphibia | Lepospondyli | Nectridea | Keraterpetontidae | |
Diplocaulus (meaning "double caul") is an extinct genus of lepospondyl amphibians from the Permian period of North America. It is one of the largest lepospondyls, with a distinctive boomerang-shaped skull. Remains attributed to Diplocaulus have been found from the Late Permian of Morocco and represent the youngest known occurrence of a lepospondyl.