Godfrey Mullen, OSB (born January 22, 1966) is an American Catholic priest who was appointed Bishop of Belleville in 2026. He is a member of the Benedictines.
Mullen was born in Alton, Illinois, on January 22, 1966. Mullen earned a bachelor's degree in history (1988), a master's degree in theology (1991), and a master of divinity (1994) from St. Meinrad College in Indiana. He later completed a Ph.D. in liturgical studies at The Catholic University of America in 2003. He joined Saint Meinrad Archabbey in Indiana and professed solemn vows as a member of the Order of Saint Benedict on August 15, 1992.
Mullen was ordained a priest on on June 5, 1994, and served in many positions in the Diocese of Evansville, including as rector of St. Benedict Cathedral in Evansville, where he also served as dean of the South Deanery and administrator pro tempore of Resurrection Catholic Church. He also held the roles of vicar general and moderator of the curia for the diocese.
Mullen later moved to the Diocese of Belleville, where he became rector of the Cathedral of Saint Peter and served as pastor of both Blessed Sacrament Parish and Queen of Peace Parish. He has also published several articles and books on liturgical topics.
On March 31, 2025, Pope Francis appointed Bishop Michael McGovern of Belleville as the sixth Archbishop of Omaha, creating a vacancy in the diocese. On May 9, 2025, the College of Consultors of the Diocese of Belleville elected Mullen as diocesan administrator to lead the diocese until a new bishop was appointed.
On March 13, 2026, Pope Leo XIV appointed Mullen the tenth Bishop of Belleville. The appointment was announced in Washington, D.C., by Cardinal Christophe Pierre, the Apostolic Nuncio to the United States. His episcopal consecration is scheduled for May 1, 2026.