Isalorhynchus is an extinct genus of hyperodapedontine rhynchosaur from the late Triassic period (Carnian stage) of Toliara Province, southwestern Madagascar.

It is known from the holotype MDE-R18, a nearly complete maxilla and from other specimens from the same locality, Malio River area.

[1] The majority of Isalorhynchus specimens are isolated jaw bones, but two nearly complete skeletons were found in 1998.

[3] Whatley, 2005 retained this genus as valid with a description of new materials in her PhD thesis.

[5][6] Isalorhynchus in a cladogram based on Ezcurra et al. (2016):[7] Noteosuchus Mesosuchus Howesia Eohyosaurus Rhynchosaurus Mariante rhynchosaur Stenaulorhynchus Langeronyx Bentonyx Fodonyx Isalorhynchus Teyumbaita Hyperodapedon