Changchunsaurus (meaning "Changchun lizard") is an extinct genus of small herbivorous dinosaur from Early Cretaceous deposits of Gongzhuling, Jilin, China.

[1] Changchunsaurus was first named by Zan Shu-Qin, Chen Jun, Jin Li-Yong and Li Tao in 2005.

Changchunsaurus is based on the holotype JLUM L0403-j–Zn2, a skeleton and skull, with a premaxilla (upper beak) and partial lower jaw also known.

It was originally classified as a basal ornithopod, family unknown, although it was not included in a formal phylogenetic analysis.

[4] Stormbergia Agilisaurus Hexinlusaurus Marginocephalia Orodromeus Haya Changchunsaurus Jeholosaurus Hypsilophodon to Iguanodontia