五角龙属（属名：Pentaceratops）是角龙科恐龙的一属，化石大部分发现于美国新墨西哥州圣胡安盆地的Kirtland地层，地质年代为晚白垩纪，约7500万年前到7300万年前。五角龙的身长约8公尺，体重估计约为5500公斤。与五角龙生存于同一地区的恐龙包含：短冠副栉龙、厚头龙下目的倾头龙、甲龙类的结节头龙、可能还有暴龙科的惧龙。五角龙的化石纪录，明确分隔了茱蒂斯河动物群的结束、Kirtland动物群的开始 。

五角龙的属名意为「有五根角的面孔」，penta/πέντα意为「五」，ceras/κέρας意为「角」，而-ops/ωψ意为「面孔」，五根角除了两根额角与一根鼻角以外，还有眼睛下侧的尖刺。

Pentaceratops (five-horned face) is a genus of herbivorous ceratopsid dinosaur from the late Cretaceous Period of what is now North America.

Pentaceratops fossils were first discovered in 1921. The genus was named in 1923 when its type species Pentaceratops sternbergii was described. Pentaceratops lived around 76-73 million years ago, its remains having been mostly found in the Kirtland Formation in the San Juan Basin in New Mexico. Other dinosaurs which shared its habitat include Parasaurolophus cyrtocristatus, the pachycephalosaur Sphaerotholus, the armored dinosaur Nodocephalosaurus and the tyrannosauroid Bistahieversor. About a dozen skulls and skeletons have been uncovered, so that most bones are known. One exceptionally large specimen later became its own genus, Titanoceratops, due to its more derived morphology closer to Triceratops and lack of unique characters shared with Pentaceratops proper, although the author that originally assigned it to Pentaceratops has decided to ignore this in subsequent publications.