Johann Caspar Ferdinand Fischer (some authorities use the spelling Johann Kasper Ferdinand Fischer) (died 1746) was a German Baroque composer. Johann Nikolaus Forkel ranked Fischer as one of the best composers for keyboard of his day, however, partly due to the rarity of surviving copies of his music, his music is rarely heard today. Fischer seems to have been of Bohemian origin, possibly born at Schönfeld, but details about his life are sketchy.

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