| Named By: | Seeley in 1892 |
| Time Period: | Middle Permian, 265.8-251 Ma |
| Location: | South Africa |
| Size: | 30 centimetres long |
| Diet: | Herbivore |
| Fossil(s): | Several individual specimens |
| Classification: | | Chordata | Reptilia | Sauropsida | Parareptilia | Millerettidae | |
Eunotosaurus is an extinct genus of reptile, possibly a close relative of turtles, from the late Middle Permian (Capitanian stage) Karoo Supergroup of South Africa. It is often considered as a possible "missing link" between turtles and their prehistoric ancestors. Its ribs were wide and flat, forming broad plates similar to a primitive turtle shell, and the vertebrae were nearly identical to those of some turtles. It is possible that these turtle-like features evolved independently of the same features in turtles, though some studies suggest Eunotosaurus is a genuine, primitive turtle relative. Other anatomical studies and phylogenetic analysis suggest that Eunotosaurus is a parareptile and not a basal turtle.