Oudin is a surname. Notable people with the surname include:
César Oudin (c.1560–1625), French linguist and philologist Casimir Oudin (1638-1717), French monk and bibliographer Eugène Oudin (1858–1894), American baritone, composer and translator Manny Oudin (born 1968), American soccer coach and player Melanie Oudin (born 1991), American tennis player Paul Oudin (1851–1923), French doctor