| Named By: | O'Keefe and Wahl in 2003 |
| Time Period: | Late Jurassic, Oxfordian |
| Location: | USA, Wyoming - Sundance Formation |
| Size: | Around 2 meters long |
| Diet: | Piscivore |
| Fossil(s): | Partial skeletal remains and elements of the skull |
| Classification: | | Chordata | Reptilia | Sauropterygia | Plesiosauria | Cryptoclididae | Aristonectidae | |
| Also known as: | | Cimoliasaurus laramiensis | Tricleidus laramiensis | |
Tatenectes is an extinct genus of cryptoclidid plesiosaur known from the Upper Member of the Sundance Formation (late Jurassic) of Wyoming. It was named by O'Keefe and Wahl in 2003 and the type species is Tatenectes laramiensis.