Karl Fischer
Karl Fischer may refer to:
- Karl Fischer (chemist), German originator of Karl Fischer titration
- Karl Fischer (resistance fighter), Austrian politician
- , Austrian football coach: Pogoń Lwów, Legia Warsaw
- Karl Fischer (leftist), German militant in Left Communism
- Karl Fischer (architect), Canadian architect
- Karl Fischer (footballer), Estonian footballer
- Karl von Fischer, German architect
- Karl Fischer (actor), Austrian actor known for co-starring in the Donna Leon TV series
- Karl Fischer von Treuenfeld, Generalleutnant of Waffen SS
- Karl Fischer (photographer), German-born Russian photographer