| Named By: | Y. N. Cheng, X. C. Wu, T. Sato, H. Y. Shan in 2012 |
| Time Period: | Middle Triassic, Ladinian |
| Location: | China |
| Size: | Holotype specimen roughly 73-74 centimetres long |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Almost complete skeleton |
| Classification: | | Chordata | Reptilia | Sauropterygia | Eosauropterygia | |
Qianxisaurus is an extinct genus of pachypleurosaur or alternatively a basal eosauropterygian known from the Middle Triassic (Ladinian age) of Guizhou Province, southwestern China. It contains a single species, Qianxisaurus chajiangensis.