Corusichthys is an extinct marine pycnodontiform that lived during the Late Cretaceous of what is now Lebanon. It contains a single species, C. megacephalus from the late Cenomanian-aged Haqel site of the Sannine Formation.

C. megacephalus is known from a 34 mm long fossil. It had plates arranged like a helmet around its head, and had a massive, triangular spine on its dorsal side. C. megacephalus is closely related the genera Trewavasia and Hensodon, as well as Coccodus.