Rabbi Yonasan Steif (Yiddish: יונתן שטייף; 1877–1958) was a senior dayan of Budapest, Hungary, before the Second World War, a man whom Rabbis Moshe Feinstein and Joel Teitelbaum referred to as the gadol hador (spiritual leader of the generation). He was a world-renowned posek and halachic authority. He served as senior dayan together with Rabbi . The Rosh Beth Din was Rabbi . While Rabbi Steif may have assumed the role of rosh beth din as the year 1944 approached, he was not such for most of his tenure.