| Named By: | Joseph Leidy in 1856 |
| Time Period: | Upper Cretaceous |
| Location: | USA, Montana - Judith River Formation |
| Size: | Uncertain |
| Diet: | Herbivore |
| Fossil(s): | Teeth |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Thyreophora | Ankylosauria | |
Palaeoscincus (meaning "ancient skink" from the Greek palaios and skiggos) is a dubious genus of ankylosaurian dinosaur based on teeth from the mid-late Campanian-age Upper Cretaceous Judith River Formation of Montana. Like several other dinosaur genera named by Joseph Leidy (Deinodon, Thespesius, and Trachodon), it is an historically important genus with a convoluted taxonomy that has been all but abandoned by modern dinosaur paleontologists. Because of its wide use in the early 20th century, it was somewhat well-known to the general public, often through illustrations of an animal with the armor of Edmontonia and the tail club of an ankylosaurid.