A new ginglymodian fish Beiduyu qijiangensis, gen. et sp. nov., is described from the freshwater Upper Jurassic Suining Formation of Chongqing, China. Although the fish is not completely preserved, it is most similar to Lepidotes and Scheenstia, which were once considered to be members of the Semionotiformes but are currently considered to be basal members of the Lepisosteiformes. The new fish lacks the strong dorsal ridge scales found in the Semionotiformes but has other features such as ganoid scales with anterodorsal and anteroventral processes but a reduced dorsal peg found in these basal lepisosteiform genera. With the description of this new taxon, there are three distinct ginglymodian fishes now known from southern China, all of them from Sichuan Province.