Dissacus is a genus of extinct carnivorous jackal to coyote-sized mammals within the family Mesonychidae whose fossils are found in Paleocene to Early Eocene aged strata in France, Asia and southwest North America, 66—50.3 mya, existing for approximately 15.7 million years. The bear-sized Ankalagon is closely related to Dissacus, being regarded as a sister or daughter genus.