| Named By: | F. Nopcsa in 1931 |
| Time Period: | Middle Triassic, 245-228 Ma |
| Location: | Europe and China |
| Size: | Specimens range from 20 to 100 centimetres long |
| Diet: | Insectivore |
| Fossil(s): | Many individuals |
| Classification: | | Chordata | Reptilia | Archosauromorpha | Protorosauria | |
Macrocnemus is an extinct genus of archosauromorph reptile from the Middle Triassic of Europe and China.