Karl (Rudolf) Engel (Birsfelden, 1 June 1923 - Chernex, 2 September 2006) was a Swiss pianist. 　　In 1952 Engel was awarded the second prize at the Queen Elisabeth competition. Throughout his concert career, he cultivated the art song repertory and worked extensively on works of Wolfgang Amadeus Mozart, Ludwig van Beethoven and Robert Schumann. He also held a professorship at Musikhochschule Hannover for three decades. 　　Engel was a student of Paul Baumgartner (1903–1976) at the Basel Conservatory from 1942 to 1945. After World War II, he studied with Alfred Cortot at the École Normale de Musique de Paris in 1947-1948. In 1952, he won 2nd prize at the Queen Elisabeth of Belgium Competition in Brussels.