Sinopliosaurus is a genus of pliosauroid plesiosaur, a type of short-necked marine reptile, from the Bathonian until Cenomanian (disputed Sinopliosaurus remains have been dated to the Toarcian age) of the People's Republic of China. The type species, Sinopliosaurus weiyuanensis, was named and described in 1944 by Yang Zhongjian. One species, "S." fusuiensis, was later shown to be based on teeth from a spinosaurid theropod dinosaur. S. weiyuanensis would have lived near a coastal environment and lived alongside the sauropod Sanpasaurus yaoi and an undescribed stegosaur genus.
- C.-C. Young. 1944. On the reptilian remains from Weiyuan, Szechuan, China. Bulletin of the Geological Society of China 24(3–4):187-205
- Buffetaut, E.; Suteethorn, V.; Tong, H.; Amiot, R. (2008). "An Early Cretaceous spinosaur theropod from southern China". Geological Magazine. 145 (5): 745–748. doi:10.1017/S0016756808005360.