| Pachyaena Temporal range: Paleocene–Early Eocene |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Mesonychia |
| Family: | Mesonychidae |
| Genus: | Pachyaena |
| Species | |
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Pachyaena (literally, "Thick Hyena") was a genus of heavily built, relatively short-legged mesonychids that originated from Asia. The species ranged in size from a coyote to a bear. During the height of their influence, the species of Pachyaena, similar to those of Dissacus before them, ranged from Asia to North America.