| Named By: | Daniel Chure in 1995 |
| Time Period: | Late Jurassic, 150 Ma |
| Location: | USA, Oklahoma - Morrison Formation. Possibly New Mexico as well |
| Size: | Estimated 13 meters long |
| Diet: | Carnivore |
| Fossil(s): | Partial remains of the post cranial skeleton, possibly representing several individuals. Additional post cranial remains possibly also from New Mexico |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Theropoda | Allosauridae | |
| Also known as: | | Saurophagus maximus | |
Saurophaganax ("lord of lizard-eaters") is a genus of allosaurid dinosaur from the Morrison Formation of Late Jurassic Oklahoma (latest Kimmeridgian age, about 151 million years ago), USA. Some paleontologists consider it to be a species of Allosaurus (A. maximus). Saurophaganax represents a very large Morrison allosaurid characterized by horizontal laminae at the bases of the dorsal neural spines above the transverse processes, and "meat-chopper" chevrons. The maximum size of S. maximus has been estimated at anywhere from 10.5 metres (34 ft) to 13 m (43 ft) in length, and around 3 tonnes (3.0 long tons; 3.3 short tons) in weight.