鹦鹉嘴龙属（属名：Psittacosaurus）又译鹦鹉龙，在希腊文意为“鹦鹉蜥蜴”，是角龙下目鹦鹉嘴龙科的一属，生存早白垩纪的亚洲，约1亿3000万年前到1亿年前。鹦鹉嘴龙因为是拥有最多种的恐龙而著名，其中有9到11个种被认为是有效种，化石发现于中国、蒙古、俄罗斯，以及一个在泰国发现的可能种。

鹦鹉嘴龙的所有种都是大小类似瞪羚的二足、草食性恐龙，特征是上颌高而强壮的喙状嘴。至少有一个种，尾巴与下背部有鬃毛状的结构，可能作为视觉展示作用。鹦鹉嘴龙是非常早的角龙下目恐龙，牠们独自发展出许多特征，也有许多与较晚角龙类相同的生理结构特征，例如原角龙以及大象体型的三角龙。

Psittacosaurus (/ˌsɪtəkəˈsɔːrəs/ SIT-ə-kə-SOR-əs; "parrot lizard") is a genus of extinct ceratopsian dinosaur from the Early Cretaceous of what is now Asia, existing between 123.2 and 100 million years ago. It is notable for being the most species-rich dinosaur genus. Up to 11 species are known, from across Mongolia, Siberia, China, and possibly Thailand. The species of Psittacosaurus were obligate bipeds at adulthood, with a high skull and a robust beak. One individual was found preserved with long filaments on the tail, similar to those of Tianyulong, and scales across the rest of the animal. Psittacosaurus probably had complex behaviours, based on the proportions and relative size of the brain. It may have been active for short periods of time during the day and night, and had well-developed senses of smell and vision.