| Named By: | J. Lu, T. Li, S. Zhong, Q. Ji & S. Li in 2008 |
| Time Period: | Middle Jurassic |
| Location: | China - Zhanghe Formation |
| Size: | Unavailable |
| Diet: | Herbivore |
| Fossil(s): | Partial remains |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropoda | Mamenchisauridae | |
Eomamenchisaurus (meaning "dawn Mamenchisaurus") is a genus of mamenchisaurid sauropod dinosaur from the Middle Jurassic of Yuanmou, Yunnan, China. The type species is E. yuanmouensis, described by Lu et al. in 2008.