| Named By: | HansinDieter Sues in 1980 |
| Time Period: | Early Cretaceous, Aptian-Albian |
| Location: | USA, Montana, Carbon County- Cloverly Formation. Possibly elsewhere in the US |
| Size: | 1.8 meters long |
| Diet: | Herbivore |
| Fossil(s): | Based upon a partial skull and post cranial skeleton, including vertebrae and ribs. Further individuals have now been identified and described |
| Classification: | | Chordata | Reptilia | Dinosuria | Ornithischia | Ornithopoda | |
Zephyrosaurus (meaning "westward wind lizard") is a genus of orodromin ornithopod dinosaur. It is based on a partial skull and postcranial fragments discovered in the Aptian-Albian-age Lower Cretaceous Cloverly Formation of Carbon County, Montana, USA. New remains are under description, and tracks from Maryland and Virginia, also in the USA, have been attributed to animals similar to Zephyrosarus.