| Named By: | Paul Gervais in 1877 |
| Time Period: | Late Paleocene-Early Eocene[1] |
| Location: | Europe and North America |
| Size: | Around 80 centimetres long and 2 kilograms in weight |
| Diet: | Uncertain - refer to main text for more details |
| Fossil(s): | Multiple specimens numbering well over a hundred. Many of these are fragmentary but a few are almost complete and some even show the impression of skin and hair as an outline of carbonaceous film |
| Classification: | | Chordata | Mammalia | Plesiadapiformes | Plesiadapoidea | Plesiadapidae | |
| Also known as: | | Menatotherium | Nothodectes | |
Plesiadapis is one of the oldest known primate-like mammal genera which existed about 55-58 million years ago in North America and Europe. Plesiadapis means "near-Adapis", which is a reference to the Eocene lemuriform, Adapis. Plesiadapis tricuspidens, the type specimen, is named after the three cusps present on its upper incisors.