Temporal range: Campanian
|The reconstructed skeleton of Avasaurus montanahorneri|
| †Avasaurus montanahorneri|
Avasaurus montanahorneri (meaning 'Ava's horned lizard from Montana') is an extinct species of nasutoceratopsine dinosaur from the genus Avasaurus. The type specimen of Avasaurus, which was nicknamed "Ava", was reported to have been around 3-3.5 meters long.