| Named By: | Peter M. Galton & Kenneth Carpenter in 2016 |
| Time Period: | Late Jurassic, 150 Ma |
| Location: | USA, Wyoming - Morrison Formation |
| Size: | Roughly estimated at about 5.7 meters long |
| Diet: | Herbivore |
| Fossil(s): | Partial post cranial skeleton including vertebrae, ribs, ischia, partial pubis, right femur, and four tail spines |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Thyreophora | Stegosauria | Stegosauridae | |
| Also known as: | | Stegosaurus longispinus | |
Alcovasaurus is a genus of herbivorous thyreophoran dinosaur that lived in the Late Jurassic. It was found in the Morrison Formation of Natrona County, Wyoming, United States. The type species is Stegosaurus longispinus, the combinatio nova Alcovasaurus longispinus.