| Named By: | Rainer Zangerl in 1953 |
| Time Period: | Late Cretaceous, 83 Ma |
| Location: | USA - Alabama - Selma Formation |
| Size: | Unavailable |
| Diet: | Omnivore |
| Fossil(s): | Possibly few specimens |
| Classification: | | Chordata | Reptilia | Testudines | Cryptodira | Protostegidae | Chelospharginae | |
| Also known as: | | Protostega advena | |
Chelosphargis is an extinct genus of sea turtle from Upper Cretaceous of Alabama. Only one species has been described, Chelosphargis advena.