Guarinisuchus is an extinct genus of crocodyliform from the Late Cretaceous and Early Paleocene periods, 66-62 million years ago of the María Farinha Formation, Brazil. It was a dominant predator in its environment, and reached a length of 3 m (10 ft). "Guarinisuchus" appears to be closely related to marine crocodylomorphs found in Africa, which supports the hypothesis that the group originated in Africa and migrated to South America before spreading into the waters off the North American coast.