| Sinornithomimus Temporal range: Late Cretaceous,
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| Skeletal restorations of an adult (left) and juvenile (right) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Clade: | †Ornithomimosauria |
| Family: | †Ornithomimidae |
| Genus: | †Sinornithomimus Kobayashi & Lü, 2003 |
| Species: | †S. dongi
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| Binomial name | |
| †Sinornithomimus dongi Kobayashi & Lü, 2003
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Sinornithomimus is a genus of ornithomimid that lived in Asia during the Late Cretaceous period. The first remains were found in 1997, in the Late Cretaceous strata of the Ulansuhai Formation located at Alshanzuo Banner, Inner Mongolia Autonomous Region, Northern China.