| Named By: | Yoshitsugu Kobayashi and Lu Junchang in 2003 |
| Time Period: | Late Cretaceous, 92 Ma |
| Location: | Mongolia - Ulansuhai Formation |
| Size: | 2 meters long |
| Diet: | Uncertain, but thought to be more herbivorous rather than omnivorous like similar dinosaurs |
| Fossil(s): | Many individuals including juveniles |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Theropoda | Ornithomimidae | |
Sinornithomimus is a genus of ornithomimid theropod dinosaur found in 1997, in the early Late Cretaceous strata of the Ulansuhai Formation located at Alshanzuo Banner, Nei Mongol Autonomous Region, Northern China.