| Siamotyrannus Temporal range: Early Cretaceous,
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| Illustration of the pelvic bones and tail vertebrae | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Clade: | Avetheropoda |
| Genus: | †Siamotyrannus Buffetaut, Suteethorn & Tong, 1996 |
| Species: | †S. isanensis
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| Binomial name | |
| †Siamotyrannus isanensis | |
Siamotyrannus (meaning "Siamese tyrant") is a genus of theropod dinosaur from the early Cretaceous of Thailand.