The Roman Catholic Diocese of San Bartolomé de Chillán (Latin: Sancti Bartholomaie de Chillán) is a diocese located in the city of Chillán in the ecclesiastical province of Concepción in Chile. (The diocese name was changed on November 1, 2017.)

• 1916: Established as Mission “sui iuris” of Chillán from the Diocese of Concepción
• 18 October 1925: Promoted as Diocese of Chillán
• 1 November 2017: Renamed as Diocese of San Bartolome de Chillán

• Bishops of San Bartolome de Chillán (Roman rite), below
  • Bishop Sergio Hernán Pérez de Arce Arriagada, SS.CC. (6 February 2020 –)
  • Bishop Carlos Pellegrín Barrera, S.V.D. (see below 2017 November 1 – 2018 September 21)
• Bishops of Chillán (Roman rite), below
  • Bishop Carlos Pellegrín Barrera, S.V.D. (2006 March 25 – 2017 November 1 see above)^[1]
  • Bishop Alberto Jara Franzoy (1982 April 30 – 2006 March 25)
  • Bishop Francisco José Cox Huneeus (1974 December 14 – 1981 November 9), appointed Coadjutor Archbishop of La Serena
  • Bishop Eladio Vicuña Aránguiz (1955 August 28 – 1974 July 16), appointed Archbishop of Puerto Montt
  • Bishop Jorge Larraín Cotapos (1937 March 20 – 1955 August 10)
  • Bishop Martín Rucker Sotomayor (1925 December 14 – 1935 January 6)
  • Bishop Martín Rucker Sotomayor (Apostolic Administrator 1923 March 16 – 1925 December 14)
  • Fr. Luis A. Venegas Henríquez (Apostolic Administrator 1922 – 1924)
  • Fr. Zacarías Muñoz Henríquez (Apostolic Administrator 1920 – 1921)
  • Bishop Reinaldo Muñoz Olave (Apostolic Administrator 1916 March 1 – 1920)