Karol Schayer (25 December 1900 in Lwów – 15 March 1971 in Rockford, Illinois) was a Polish architect and soldier. He designed buildings in Katowice, Warsaw, and (during and after World War II) in Beirut, Lebanon. Schayer immigrated to Lebanon during World War II where he collaborated with , a German architect educated in the spirit of the Bauhaus, and Bahij Makdissi, a Lebanese structural engineer.