Johannes Quasten (3 May 1900 in Homberg – 10 March 1987 in Freiburg im Breisgau) was a Roman Catholic theologian and scholar of patristics. He studied Roman Catholic theology at the Westfälische Wilhelms University (Wilhelm's University of Westphalia ) in Münster. In 1926 he was ordained priest. In 1927 he earned his graduate Degree with F.J. Dölger in Münster with a thesis on "Music and singing in the cults of the ancient pagan and early Christian times". Further studies followed in the years 1927-1929 in Rome at the Pontificio Istituto di Archeologia Cristiana. At the same time, he served as chaplain at the Campo Santo Teutonico. He received a grant from the Association of German science in the German Archaeological Institute in Rome and took part with the Gorres-Gesellschaft in international excavations. In 1931 he qualified as a professor in Münster. After confrontations with the Nazi regime, he moved to Rome. Through the mediation of Clemens August Graf von Galen, and through the intercession of the Cardinal Pacelli (later Pope Pius XII.), he moved to the United States of America in 1938, joined the Catholic University of America in 1938 and progressed through its ranks until he retired in 1970. With his retirement in 1970, he was appointed Honorary Professor of Catholic Theology at the Faculty of the University of Freiburg in Breisgau.