Erected as Diocese of Trincomalee/Batticaloa, separating from the Archdiocese of Colombo in 1893, which is suffragan to the Archdiocese of Colombo. This diocese was made out of the diocese of Trincomalee and the diocese of Batticaloa. It was renamed as the Diocese of Trincomalee when the Diocese of Batticaloa was separated in 2012.
Ordinary
- Most Rev. Dr. Noel Emmanuel
Diocesan Director of Education
- Rev. Fr. Soosaimuthu Douglas James
Notable Schools
| Name | Year | Location | Age |
|---|---|---|---|
| St. Mary’s College | 1864 | Trincomalee | 156 |
| St. Joseph’s College | 1867 | Trincomalee | 153 |
| St. Michael’s College | 1873 | Batticaloa | 147 |
| St. Cecilia’s Girls’ College | 1876 | Batticaloa | 144 |
Bishops
- Most Rev. Dr. Charles Lavigne SJ, Bishop of Trincomalee from 1898 – 1913
- Most Rev. Dr. Gaston Robichez SJ, Bishop of Trincomalee from 1917 – 1946
St. Angnes’ Convent, Balangoda
- Most Rev. Dr. Ignatius Glennie SJ, Bishop of Trincomalee from 1947 – 1974
- Most Rev. Dr. Leo Rajendram Antony, Bishop of Trincomalee from 1974 – 1983
- Most Rev. Dr. Kingsley Swampillai, Bishop of Trincomalee from 1983 – 2015
- Most rev. Dr. Noel Emmanuel, Bishop of Trincomalee from 2015 –
