The Roman Catholic Diocese of Mysore is a suffragan Latin diocese, in the ecclesiastical province of Bangalore in southern India, yet depends on the missionary Dicastery for Evangelization. Its cathedral episcopal see is St. Philomena's Cathedral in the city of Mysore in Karnataka.

The Roman Catholic Metropolitan Archdiocese of Bangalore is an ecclesiastical territory or diocese of the Catholic Church in India. It was erected as pro-vicariate from, as Vicariate from, as Diocese of Mysore - Bangalore in the Ecclesiastical Metropolitan Province of Pondicherry in Southern India from, as Diocese of Bangalore on 13 February 1940 by Pope Pius XII, and elevated to the rank of a Metropolitan Archdiocese on 19 September 1953, with the Suffragan Dioceses of Belgaum, Bellary, Chikmagalur, Gulbarga, Karwar, Mangalore, Udupi, Mysore, and Shimoga.