Myledaphus is a genus of Late Cretaceous cartilaginous fish whose fossils are known from Canada, the Midwest of the United States, Olmos Formation of the Difunta Group of Mexico, and the and Bissekty Formations of Uzbekistan. It was a freshwater guitarfish that probably reached a length of 3 feet (91 cm), and had teeth adapted for a durophagous diet of animals such as clams. Most taxonomic authories place the genus in the Rhinobatidae. Two species are known: Myledaphus bipartitus, the type species, and Myledaphus araucanus, named in 2019.