Thaisaurus
| Thaisaurus Temporal range: Early Triassic | |
|---|---|
| Fossil | |
| Scientific classification | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Chordata | 
| Class: | Reptilia | 
| Superorder: | †Ichthyopterygia | 
| Family: | †Thaisauridae Maisch, 2010 | 
| Genus: | †Thaisaurus Mazin et al., 1991 | 
| Type species | |
| †Thaisaurus chonglakmanii Mazin et al., 1991 | |
Thaisaurus is an extinct genus of ichthyopterygian marine reptile that lived during the Spathian (late Olenekian, Early Triassic). Fossils have been found in Thailand.