| Named By: | K. Carpenter, J. I. Kirkland, D. L. Burge & J. Bird in 1999 |
| Time Period: | 104.46-98.37 Ma |
| Location: | USA, Utah - Cedar Mountain Formation, Messentuchit Member |
| Size: | Skull about 25 centimetres long. Body length uncertain due to lack of remains, but comparison to other nodosaurs suggests up to about 3 meters for the total body length |
| Diet: | Herbivore |
| Fossil(s): | Lower jaw, back of the skull and some cervical (neck) and dorsal (back) vertebrae |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Thyreophora | Ankylosauria | Nodosauridae | |
Animantarx ( an-i-MAN-tarks; "living citadel") is a genus of nodosaurid ankylosaurian dinosaur from the Upper Cretaceous of western North America. Like other nodosaurs, it would have been a slow-moving quadrupedal herbivore covered in heavy armor scutes, but without a tail club. The skull measures approximately 25 cm (10 inches) in length, suggesting the animal as a whole was no more than 3 meters (10 feet) long.