John Fischer may refer to:John Fischer (baseball) (1855–1942), Major League pitcher and first baseman John Fischer (judge), Oklahoma Court of Civil Appeals John Fischer (painter) (1786–1875), German painter John Fischer (pianist) (1930–2016), American jazz pianist John Fischer (politician), Australian politician John Fischer, mayor of Anaheim, California, 1876–1877 John Henry Fischer (1910–2009), academic administrator in Baltimore John Martin Fischer, professor of philosophy at the University of California, Riverside Johnny Fischer (1912–1984), American golfer