The Diocese of Lausanne, Geneva and Fribourg is a Latin Catholic diocese in Switzerland, which is exempt. The original diocese of Lausanne was a suffragan of the archdiocese of Besançon, through the 18th century. The diocese of Geneva was a suffragan of the archdiocese of Vienne.

The Diocese of Sion is a Latin Catholic ecclesiastical territory in the canton of Valais, Switzerland. It is the oldest bishopric in the country and one of the oldest north of the Alps. The history of the Bishops of Sion, of the Abbey of St. Maurice of Valais as a whole are inextricably intertwined.