| Named By: | K. Li, C.inY. Yang, J. Liu & Z.inX. Wang in 2010 |
| Time Period: | Early Jurassic |
| Location: | China, Sichuan - Yimen Formation |
| Size: | Unavailable |
| Diet: | Herbivore |
| Fossil(s): | Partial limbs and twenty vertebrae |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropoda | Mamenchisauridae | |
Tonganosaurus (named for the town of Tong'an from where it was found) is a genus of mamenchisaurid sauropod dinosaur, similar to Omeisaurus. It is known from one specimen consisting of twenty vertebrae, a front limb and pectoral girdle, and a complete hind limb with partial hip. It lived during the early Jurassic period (Hettangian - Toarcian, Yimen Formation) in what is now China. It was first named by Li Kui, Yang Chun-Yan, Liu Jian and Wang Zheng-Xin in 2010 and the type species is Tonganosaurus hei.