Diocese of Ratnapura (Lat: Dioecesis Ratnapurensis) is a Latin Catholic diocese of the Catholic Church in Sri Lanka.

Erected as the Diocese of Ratnapura in 1995, from the Diocese of Galle territory, the diocese is suffragan to the Archdiocese of Colombo.

The current bishop is Peter Antony Wyman Croos, appointed in 2024.

Ordinaries Malcolm Ranjith (2 Nov 1995 – 1 Oct 2001), appointed to various curial positions and later appointed Archbishop of Colombo (elevated to Cardinal in 2010) Harold Anthony Perera (29 Jan 2003 – 15 Feb 2005), appointed Bishop of Galle and later Bishop of Kurunegala Ivan Tilak Jayasundera (20 Jan 2006 – 6 Jul 2006), resigned before episcopal consecration due to poor health Cletus Chandrasiri Perera, O.S.B.Silv. (4 May 2007 – 5 Mar 2024) Peter Antony Wyman Croos (2024 – present)

See also Catholic Church in Sri Lanka

References