John Fischer
John Fischer may refer to:
- John Fischer (baseball), Major League pitcher and first baseman
- John Fischer (judge), Oklahoma Court of Civil Appeals
- John Fischer (painter), German painter
- John Fischer (pianist), jazz pianist
- John Fischer (politician), Australian
- John Fischer, mayor of Anaheim, California, 1876–1877
- John [Henry Fischer], academic administrator in Baltimore
- John Martin Fischer, professor of philosophy at the University of California, Riverside
- Johnny Fischer, American golfer