Karl Neumann may refer to:
Karl Friedrich Neumann (1793–1870), German orientalist Karl Eugen Neumann (1865–1915), translated Buddhist scriptures into German Karl August Neumann (1771–1866), German-Austrian chemist Karl Johannes Neumann (1857–1917), German classical historian Carl Neumann (1832–1925), German mathematician Carl Magnus Neumann (born 1944), saxophonist