Corosaurus is an extinct genus of pistosauroid known from Wyoming of the United States.

[3] Corosaurus is known from the holotype UW 5485, a partial skeleton which includes the skull.

All specimens were collected in Jackson Canyon, Natrona County, from the Chugwater Group of the Alcova Limestone Formation, dating to the late Olenekian stage of the late Early Triassic, about 247.4-245 million years ago.

[1] Corosaurus was placed in its own family, Corosauridae, which named by Oskar Kuhn, in 1961.

[4] After a revision of the holotype and referred material of Corosaurus, Olivier Rieppel found Corosaurus to be the sister-taxon to a clade comprising Cymatosaurus, Pistosaurus and Plesiosauria.