Karl Fischer may refer to:
Karl Fischer (chemist) (1901–1958), German originator of Karl Fischer titration Karl Fischer (resistance fighter) (1918–1963), Austrian politician (1888–?), Austrian football coach: Pogoń Lwów, Legia Warsaw Karl Fischer (leftist) (fl. 1940s), German militant in Left Communism Karl Fischer (architect) (1949–2019), Canadian architect Karl Fischer (footballer), Estonian footballer Karl von Fischer (1782–1820), German architect Karl Fischer (actor), Austrian actor known for co-starring in the Donna Leon TV series Karl Fischer von Treuenfeld (1885–1946), Generalleutnant of Waffen SS Karl Fischer (photographer), German-born Russian photographer Karl Fischer (politician) (1893–1940), German communist politician
See also Carl Fischer (disambiguation)