| Named By: | A. S. Romer in 1971 |
| Time Period: | Middle Triassic, 236-234 Ma |
| Location: | Argentina - Chanares Formation |
| Size: | Roughly about 30 centimetres long |
| Diet: | Carnivore |
| Fossil(s): | Partial skeletal remains |
| Classification: | | Chordata | Reptilia | Dinosauromorpha | Lagosuchia | |
Lagosuchus is a genus of small archosaur from the middle Triassic period. It is generally thought to be closely related to dinosaurs, as a member of the Dinosauromorpha. Its fossils were found in the Chanares Formation of Argentina, dating to the Middle Triassic (Ladinian age), about 230 million years ago.