| Named By: | Louis Agassiz in 1833 |
| Time Period: | Middle Triassic, 245-235 Ma |
| Location: | Germany, France, Poland, China |
| Size: | Up to 2 meters long |
| Diet: | Shellfish |
| Fossil(s): | Many specimens |
| Classification: | | Chordata | Reptilia | Sauropterygia | Placodontia | |
Placodus (meaning 'flat tooth') was a genus of marine reptiles, belonging to the order Placodontia, which swam in the shallow seas of the middle Triassic period (c. 240 million years ago). Fossils of Placodus have been found in Central Europe (Germany, France, Poland) and China.