| Named By: | R. D. Martinez in 1998 |
| Time Period: | Late Cretaceous |
| Location: | Argentina - Bajo Barreal Formation |
| Size: | Holotype roughly about 1.3 meters long, but this is of a juvenile, fully grown adults were likely larger |
| Diet: | Herbivore |
| Fossil(s): | Partial post cranial skeleton of a juvenile including hind limb, shoulder and rib bones as well as some vertebrae |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Ornithopoda | Iguanodontia | |
Notohypsilophodon (meaning "southern Hypsilophodon") is a genus of euornithopod dinosaur from the Upper Cretaceous of Argentina. It was described as the only "hypsilophodont" known from South America, although this assessment is not universally supported, and Gasparinisaura is now believed to have been a basal euornithopod as well.