Jan Roman Bytnar (codenames: Rudy, Czarny, Janek, Krokodyl, Jan Rudy; born 6 May 1921, Kolbuszowa, Poland - died 30 March 1943, Warsaw, Poland) was a Polish Scoutmaster (harcmistrz), Polish Scouting resistance activist and Second Lieutenant of the Armia Krajowa during the Second World War. The son of Stanisław Bytnar and Zdzisława Rechulówna, Jan Bytnar is a leading character of both Aleksander Kamiński's Kamienie na szaniec and Barbara Wachowicz's Rudy, Alek, Zośka.