Yueosaurus (phonetically spelled as Yu-oh-sore-us) is a Tiantaiensis type species dinosaur which was named by Wenjie Zheng, Xingsheng Jin, Masateru Shibata, Yoichi Azuma & Fangming Yu in 2012. The classification of this species is as follows:

Chordata – Reptilia – Dinosauria – Ornithischia – Cerapoda – Ornithopoda

Yueosaurus are estimated to be about 1.5 meters long and they followed an herbivorous diet. The known location of this species is the Liangtoutang Formation in the Zhiejiang Province in China. They existed during the Aptian to the Ceomanian period of the Cretaceous era.

Yueosaurus was discovered in 1998 during the construction of a highway. The middle Cretaceous Yueosaurus is important for being the southernmost "basal" i.e., early and relatively unevolved, ornithopod dinosaur ever to be discovered in China, and may turn out to be a close relative of Jeholosaurus. Han et al found it plausible that Yueosaurus might be a member of Jeholosauridae or it might be closely related to it.

Yueosaurus is known only from the holotype ZMNH M8620. It is an extinct genus of basal ornithopod dinosaur known from the Zhejiang Province in China. It was collected in Tiantai locality from the Liangtoutang Formation, dating to the Aptian-Cenomanian stages of the latest Early Cretaceous and the earliest Late Cretaceous. The holotype is an articulated, partial but well preserved postcranial skeleton which includes cervical, dorsal and caudal vertebrae, scapula, rib, hip bones, partial forelimb and partial hindlimb. Yueosaurus represents the southernmost basal ornithopod dinosaur from Asia and it is the first one from China. It differs from other ornithischians by a combination of various characters.

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