| Named By: | Harry Govier Seeley in 1892 |
| Time Period: | Middle Jurassic, 166-164 Ma |
| Location: | England, France, South America |
| Size: | Up to 4 meters long |
| Diet: | unavailable |
| Fossil(s): | Several individuals, including adult and juvenile specimens |
| Classification: | | Chordata | Reptilia | Sauropterygia | Plesiosauria | Plesiosauroidea | Cryptoclididae | |
| Also known as: | | Apractocleidus | Cryptoclidus oxoniensis | |
Cryptoclidus ( krip-toh-KLY-das) is a genus of plesiosaur reptile from the Middle Jurassic period of England.