| Named By: | R. Kellogg in 1927 |
| Time Period: | Mid-Late Miocene~15.97-5.332 Ma |
| Location: | USA, California - Sharktooth Hill, Maryland - Saint Mary;'s Formation. Argentina, Rio Negro |
| Size: | Uncertain |
| Diet: | Carnivore |
| Fossil(s): | Several specimens |
| Classification: | | Chordata | Mammalia | Cetacea | Odontoceti | Physeteridae | |
Aulophyseter is an extinct genus of sperm whales from the Miocene formations of the west and east coasts of North America, as well as the Patagonian region of South America. It is a possible synonym of some fossils assigned to Orycterocetus.
Aulophyseter reached a length of approximately 6 metres (20 ft) with an estimated body weight of 1,100 kilograms (2,400 lb).