| Named By: | Altangerel Perle in 1979 |
| Time Period: | Late Cretaceous, 90 Ma |
| Location: | Mongolia, Bayan Shireh Formation |
| Size: | Estimated at 6 meters long |
| Diet: | Uncertain, but possibly herbivorous |
| Fossil(s): | Many individuals, but usually of partial and fragementary remains |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Theropoda | Therizinosauridae | |
Segnosaurus ('slow lizard') is a genus of herbivorous theropod dinosaur belonging to the Therizinosauridae from the Cretaceous of Mongolia.