The Belley-Ars diocese is a Roman Catholic diocese located in the eastern part of France. It was established in 1822 and is part of the Province of Lyon. The diocese covers a region that includes the towns of Belley and Ars-sur-Formans, known for its rich religious history. The diocese is dedicated to the pastoral care of its Catholic community and is known for its association with Saint John Vianney, the patron saint of priests. The Belley-Ars diocese emphasizes spiritual growth, education, and social outreach within its parishes.