The Roman Catholic Diocese of Simla and Chandigarh (Latin: Simlen(sis) et Chandigarhen(sis)) is a diocese located in the cities of Simla and Chandigarh in the ecclesiastical province of Delhi in India.

• 4 June 1959: Established as Diocese of Simla from the Metropolitan Archdiocese of Delhi and Simla
• 12 May 1964: Renamed as Diocese of Simla and Chandigarh

• Bishops of Simla and Chandigarh (Latin Rite)
  • Bishop Ignatius Loyola Mascarenhas (10 February 2009 – present)
  • Bishop Gerald John Mathias (22 December 1999 – 8 November 2007)
  • Bishop Gilbert Blaize Rego (11 March 1971 – 10 November 1999)
  • Bishop Alfred Fernández (13 April 1967 – 25 June 1970)
  • Archbishop Joseph Alexander Fernandes (Apostolic Administrator 1966 – 13 April 1967)
  • Bishop John Burke (12 May 1964 – 3 August 1966)
• Bishops of Simla (Latin Rite)
  • Bishop John Burke (4 June 1959 – 12 May 1964)

• GCatholic.org
• Catholic Hierarchy
• Website of the diocese

• Immaculate Heart Church, (Karnal)

31°06′19″N 77°10′08″E / 31.1053°N 77.1690°E / 31.1053; 77.1690