| Named By: | Z. bai, J. Yang & G. Wang in 1990 |
| Time Period: | Early Jurassic, 190 Ma |
| Location: | China, Yimen - Fengjiahe Formation |
| Size: | Roughly about 9 meters long |
| Diet: | Herbivore |
| Fossil(s): | Partial post cranial skeletons of at least ten individuals, and one skull |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropodomorpha | |
Yimenosaurus (meaning "Yiman reptile") is an extinct genus of plateosaurid sauropodomorph dinosaur that lived in Chine in the Early Jurassic. The genus was first named in 1990 by Ziqi Bai, Jie Yang and Guohui Wang, along with its type and only species, Yimenosaurus youngi. The species name honours renowned Chinese paleontologist Yang Zhongjian, the father of Chinese paleontology, known as C.C. Young in English. Known material includes the holotype, an almost complete skull and mandible, as well as incomplete cervical and dorsal vertebrae, a mostly complete sacrum, an ilium, ischia, partial ribs and complete femur, and a paratype, a well-preserved postcrania with a fragmentary skull.