Harald Poelchau (5 October 1903 in Potsdam; 29 April 1972 in West Berlin) was a German prison chaplain, religious socialist and member of the resistance against the Nazis. Poelchau grew up in Silesia. During the early 1920's, he studied Protestant theology at the University of Tübingen and the University of Marburg, followed by social work at the College of Political Science of Berlin. Poelchau gained a doctorate under Paul Tillich at Frankfurt University. In 1933, he became a prison chaplain in the Berlin prisons. With the coming of the Nazi regime in 1933, he became am anti-fascist. During the war, Poelchau and his wife Dorothee Poelchau helped victims of the Nazi's, hiding them and helping them escape. At the same time, as a prison chaplain he gave comfort to the many people in prison a