| Named By: | Fritsch in 1894 |
| Time Period: | Early-Middle Triassic, 247.5-237 Ma |
| Location: | Germany |
| Size: | Unavailable |
| Diet: | Piscivore |
| Fossil(s): | At least two individuals |
| Classification: | | Chordata | Reptilia | Sauropterygia | Pistosauroidea | |
Cymatosaurus is an extinct genus of pistosauroid or nothosauriform sauropterygian. It is known from Early Triassic to the Middle Triassic period (latest Olenekian to Anisian stages) of Germany.