Mostowski (feminine: Mostowska, plural: Mostowscy) is a surname. It may refer to:
Mostowski Palace (), an 18th-century palace in Warsaw Andrzej Mostowski (1913 - 1975), a Polish mathematician Mostowski collapse lemma, in mathematical logic Ehrenfeucht–Mostowski theorem, in model theory Mostowski model in set theory
See also Mostovsky