Karl Müller may refer to:Karl Müller (astronomer) (1866–1942), Austrian astronomer Karl Müller (botanist) (1817–1870), German botanist and mycologist Karl Müller (1893–1955), German botanist Karl Müller (bryologist) (1818–1899), German bryologist Karl Müller (1881–1955), German bryologist Karl Müller (inventor), Swiss inventor and engineer Karl Müller (rower) (1912–?), Swiss Olympic rower Karl H. Müller, Austrian social scientist Karl Otfried Müller (1797–1840), German classical scholar and admirer of Dorians and Spartans Karl Wilhelm Ludwig Müller (1813–1894), German classical scholar and editor of Fragmenta Historicorum Graecorum K. Alex Müller, Swiss physicist, 1987 Nobel Prize Karl Müller (1884–1964), German politician