Prosopocoilus buddha is a species of stag beetle (Coleoptera: Scarabaeoidea) in the tribe Cladognathini.

This Asian species is variable, with several known subspecies[1] and widely distributed from India to Sulawesi.

This is a medium-sized (males 26-63 mm) species for the genus Prosopocoilus, with a wide, glossy reddish-brown to black appearance.

The species is very variable: large males may have jaws that are long, rather thin and slightly curved, with a tooth at the root, a slightly larger tooth just outside the middle and a number of smaller teeth.

Small males tend to have short, knife-shaped and jagged jaws.