Based on new material from the top of the Late Jurassic Shangshaximiao Formation of Xiaogu, Qianwei County, southwestern Sichuan Basin, a new sinraptorid carnosaur Leshansaurus qianweiensis gen. et sp. nov. is erected. This new dinosaur was the latest carnosaur presently known in SichuanBasin. Its discovery extends the horizontal and geographical distributions of the carnosaurs in SichuanBasin, and is significant in the evolution of the carnosaurs.