| Named By: | Peter Dodson in 1986 |
| Time Period: | Late Cretaceous, 77 Ma |
| Location: | USA, Montana - Judith River Formation |
| Size: | Possibly up to 4.2 meters long |
| Diet: | Herbivore |
| Fossil(s): | Scattered partial remains |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Marginocephalia | Ceratopsia | Ceratopsidae | |
Avaceratops is a genus of small herbivorous ceratopsian dinosaurs which lived during the late Campanian during the Late Cretaceous Period in what are now the Northwest United States. Most fossils come from the Judith River Formation.