Judiceratops (/ˌdʒuːdiːˈsɛrətɒps/ JOO-dee-SERR-ə-tops; meaning "Judith River horned face") is an extinct horned dinosaur. It lived around 78 million years ago, during the Late Cretaceous Period in what is now Montana, United States. Like other horned dinosaurs, Judiceratops was a large, quadrupedal herbivore. It is the oldest known chasmosaurine.[1]