Shamolagus is an extinct genus of lagomorphs that lived in present-day Mongolia during the Upper Eocene. It contains two species, both of which are now extinct: Shamolagus grangeri and S. medius. Both of the species and the genus itself were named by paleontologist J. J. Burke in 1941 based on fossils collected in 1925 and 1928. In the same paper, Burke grouped Shamolagus with Mytonolagus and another new genus Gobiolagus in the newly-named subfamily Mytonolaginae in the rabbit family Leporidae. He further stated that Desmatolagus was descended from Shamolagus despite placing it in a separate subfamily. Further fossils in the form of isolated teeth from central China were assigned by Tong to Shamolagus sp. and Shamolagus cf. medius in 1997.