The Roman Catholic Diocese of Sintang (Latin: Sintangen(sis)) is a diocese located in the city of Sintang in the ecclesiastical province of Pontianak in Indonesia.

• March 11, 1948: Established as the Apostolic Prefecture of Sintang from the Apostolic Vicariate of Pontianak
• April 23, 1956: Promoted as Apostolic Vicariate of Sintang
• January 3, 1961: Promoted as Diocese of Sintang

• Bishops of Sintang (Roman rite)
  • Bishop Agustinus Agus (October 29, 1999 – June 3, 2014); appointed Metropolitan Archbishop of the Roman Catholic Archdiocese of Pontianak by Pope Francis
  • Fr. Agustinus Agus (later Bishop) (Apostolic Administrator 1996 – October 29, 1999)
  • Bishop Isak Doera (December 9, 1976 – January 1, 1996)
  • Bishop Lambert van Kessel, S.M.M. (May 16, 1961 – May 25, 1973)
• Prefects Apostolic of Sintang (Roman Rite)
  • Fr. Lambert van Kessel, S.M.M. (later Bishop) (Apostolic Administrator April 23, 1956 – May 16, 1961)
  • Fr. Lambert van Kessel, S.M.M. (later Bishop) (June 4, 1948 – April 23, 1956)

• GCatholic.org
• Catholic Hierarchy