Olszewski (feminine Olszewska, plural Olszewscy) is a Polish surname.
Notable people with the surname include:
Alfons Olszewski, Polish sailorDariusz Olszewski, Polish politicianEileen Olszewski, American boxerJan Olszewski, Polish lawyer and political figureJohn A. Olszewski, Jr., American politicianJohnny Olszewski, American football running backKarol Olszewski, Polish chemist, mathematician and physicistKrzysztof Olszewski, Polish photographer, visual and installation artistPaweł Olszewski, Polish economist and politicianSławomir Olszewski, Polish goalkeeperStanisław Olszewski, Polish engineer and inventorWłodzimierz Olszewski, Polish ice hockey player