Lomasuchus is an extinct genus of peirosaurid notosuchian known from the Late Cretaceous (Santonian stage) of Neuquén Province, western central Argentina.

[1][2] It is known only from the holotype MOZ 4084 PV which was found in the Loma de la Lata locality of the Neuquén Province, Patagonia.

More recent stratigraphic work on this area identified that horizon as belonging to the younger, Coniacian-age, Plottier Formation of the Rio Neuquén Subgroup.

[3] This horizon is currently considered to pertain to the Santonian-age Bajo de la Carpa Formation of the Rio Colorado Subgroup.

Many similarities can be seen between its morphology and that of the related Uberabasuchus, such as the narrow snout and a groove at the maxilla-premaxilla contact that accommodated for an enlarged fourth mandibular tooth.