The Reverend John Thiagarajah Arulanantham (13 May 1897 – 21 June 1964) was a Ceylonese Anglican priest, educator and principal of St. John's College, Jaffna. His ministry spanned more than three decades, during which he became widely respected for his leadership, scholarship, and commitment to Christian education.
Born on 13 May 1897, J.T. Arulanantham was the third of five children of Thomas Vaitilingam Arulanantham and Eliza Ponnammah (née Samuel), both of whom were teachers at the Church Missionary Society (CMS) school in Nallur. While his mother was born into the Christian faith, his father converted to Christianity as a student, adopting the surname Arulanantham, the Tamil translation of the name associated with the Portuguese Jesuit missionary and martyr St. John de Britto.
Raised in northern Ceylon, he received his early education in Nallur before attending St. John's College, Chundikuli, where the foundations of both his academic and spiritual life were established.


