The Diocese of Trincomalee was created on 25 August 1893 from parts of the
Archdiocese of Colombo and the
Diocese of Jaffna. In the Eastern Province of Sri Lanka there were two abandon regions.According to the report of Rev.FR Etinne Sameria ( omi), in 1850, in Trincomalee there were five churches with 1,500 Catholics. Every Sunday sermon was delivered in English and Tamil. The diocese was renamed Diocese of Trincomalee–Batticaloa on 23 October 1967. On 19 December 1975 parts of the diocese were transferred to newly created
Apostolic Prefecture of Anuradhapura. The diocese was renamed Diocese of Trincomalee on 3 July 2012 after parts of the diocese were transferred to newly created
Diocese of Batticaloa. ==Bishops==