Czesław Ścisłowski (Polish: tsheh'swahv shtshes'wohv'skee [ʈ͡ʂɛslaf st͡ɕislɔfskʲi]; May 22, 1904–August 12, 1971) was a Polish physicist, educator, university professor, author of school books and science articles, the initiator and organizer of International Physics Olympiad for high school students. Before World War II he was the principal teacher of the science class at the Stefan Batory High School in Warsaw, many of whose students became wartime resistance heroes.