Walter Johannes Mixa is a German prelate of the Catholic Church who is the Bishop Emeritus of Augsburg and Ordinary Emeritus of the Bundeswehr. He resigned as bishop of Military and Bishop of Augsburg on 8 May 2010 at age 69 after accusations he severely beat children at a Schrobenhausen orphanage in the 1970s and misappropriated the orphanage’s funds. Mixa reportedly sexually abused minors, including an altar boy; the Office of Public Prosecution opened investigation which it closed, citing insufficient evidence. He was also accused also of sexually abusing seminarians between 1996 and 2005.

Diocese of Augsburg is a Latin diocese of the Catholic Church in Germany. The diocese is a suffragan of the Archdiocese of Munich.