| Named By: | Thewissen et al in 1996 |
| Time Period: | Early Eocene, 47.8-41.3 Ma |
| Location: | Pakistan |
| Size: | 3 meters long |
| Diet: | unavailable |
| Fossil(s): | Several individuals with partial remains, one specimen with a much more complete skeletal frame |
| Classification: | | Chordata | Mammalia | Cetacea | Archaeoceti | Ambulocetidae | Ambulocetinae | |
Ambulocetus (meaning "walking whale") was an early cetacean with short limbs and large feet used for swimming. Along with other members of Ambulocetidae, it is a transitional fossil that shows how whales evolved from land-living mammals. While its name stems from the historical hypothesis that it was capable of walking on land, more recent research suggests that it was fully aquatic like modern cetaceans.