| Named By: | C. M. Sternberg in 1937 |
| Time Period: | Late Cretaceous, 70 Ma |
| Location: | Canada, Alberta - Horseshoe Cnayon Formation |
| Size: | About 2.5 meters long |
| Diet: | Herbivore |
| Fossil(s): | Skull and partial post cranial fossils |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Ornithopoda | |
| Also known as: | | Thescelosaurus warreni | |
Parksosaurus (meaning "William Parks's lizard") is a genus of hypsilophodont ornithopod dinosaur from the early Maastrichtian-age Upper Cretaceous Horseshoe Canyon Formation of Alberta, Canada. It is based on most of a partially articulated skeleton and partial skull, showing it to have been a small, bipedal, herbivorous dinosaur. It is one of the few described non-hadrosaurid ornithopods from the end of the Cretaceous in North America, existing around 70 million years ago.