| Named By: | Christian A. Sidor, J. Sebastien Steyer & William R. Hammer in 2014 |
| Time Period: | Middle Triassic |
| Location: | Antarctica - Fremouw Formation |
| Size: | Unavailable |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Skull |
| Classification: | | Chordata | Amphibia | Temnospondyli | Stereospondyli | Capitosauria | Mastodonsauroidea | |
Antarctosuchus is an extinct genus of capitosauroid temnospondyl known from the Middle Triassic upper Fremouw Formation in the Transantarctic Mountains of Antarctica. It contains a single species, Antarctosuchus polyodon.