| Named By: | Louis Agassiz in 1849 |
| Time Period: | Late Cretaceous, 83 Ma |
| Location: | USA, New Jersey |
| Size: | Comparison to related genera of turtles points to an estimated length of about 3 meters |
| Diet: | Carnivore |
| Fossil(s): | Humerus (upper arm bone) |
| Classification: | | Chordata | Reptilia | Testudines | Cryptodira | Protostegidae | |
Atlantochelys is an extinct genus of sea turtle from the Upper Cretaceous of New Jersey. For 163 years, only a partial humerus was known, but the second part of the same bone was found in 2012.