| Named By: | K. Brill & K. Carpenter in 2007 |
| Time Period: | Early Cretaceous, 112 Ma |
| Location: | USA, Colorado - Purgatoire Formation (Lytle Member) |
| Size: | Reconstructed length of the skull about 46 centimetres long |
| Diet: | Herbivore |
| Fossil(s): | Partial skull and lower jaws |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Ornithopoda | |
Theiophytalia is a genus of herbivorous iguanodontian dinosaur from the lower Cretaceous period (Aptian-Albian stage, about 112 million years ago) of Colorado, USA.