Vagaceratops (meaning "wandering (vagus, Latin) horned face", in reference to its close relationship with Kosmoceratops from Utah) is a genus of herbivorous ceratopsian dinosaur.

Although the general structure was typical of ceratopsids (i.e. a parrot-like beak, large neck frill, and nasal horn) it has some peculiarities.

Vagaceratops had smaller parietal fenestrae than most ceratopsids and had a strange configuration of epoccipitals (bones surrounding the frill).

It possessed ten epoccipitals, eight of which were centrally flattened, curved forward and upward and fused together to form a jagged margin along the back of the frill.

[7][6] The cladogram below is the phylogeny of the Chasmosaurinae by Brown et al. (2015):[8] Centrosaurinae Vagaceratops irvinensis Kosmoceratops richardsoni Chasmosaurus belli Chasmosaurus russeli Mojoceratops perifania Agujaceratops mariscalensis Utahceratops gettyi Pentaceratops sternbergii Bravoceratops polyphemus Coahuilaceratops magnacuerna Anchiceratops ornatus Arrhinoceratops brachyops Regaliceratops peterhewsi Eotriceratops xerinsularis Ojoceratops fowleri Titanoceratops ouranos Nedoceratops hatcheri Torosaurus latus Torosaurus utahensis Triceratops horridus Triceratops prorsus Recently it has been suggested that Chasmosaurinae had a deep evolutionary split between a Chasmosaurus clade and a Pentaceratops clade.