Roman Catholic Diocese of Leavenworth

The Diocese of Leavenworth (Latin: Dioecesis Leavenworthensis ) is a titular of the Roman Catholic Church.

The U.S. diocese was founded in the area of the Apostolic Vicariate of Kansas on May 29, 1877. It belonged to the Ecclesiastical Province of Saint Louis and was 12,524 Square Miles large. On 10 May 1947, was replaced by the Diocese of Kansas City.