Fiszer (archaic feminine: Fiszerowa) is a Polish-language transliteration of German surname Fischer. Notable people with this surname include:
Franciszek Fiszer (1860–1937), Polish socialite Stanisław Fiszer (1769–1812), Polish general and Chief of Staff of the Duchy of Warsaw Wirydianna Fiszerowa (1761–1826), Polish noblewoman and memoirist