Mahavisaurus is an extinct genus of rhytidosteid temnospondyl from the early Triassic period (Induan stage) of Iraro, Madagascar. It is known from the holotype MNHN MAE 3037, a nearly complete skull, recovered from the Middle Sakamena Formation. This genus was named by J. P. Lehman in 1966, and the type species is Mahavisaurus dentatus.