Archbishop Diarmuid Martin was born in Dublin on 8th April 1945. He attended schools in Dublin (Oblate School, Inchicore; De La Salle School, Ballyfermot; Marian College, Ballsbridge). He studied philosophy at the University College Dublin and theology at the Dublin Diocesan Seminary (Holy Cross College, Clonliffe).
He was ordained a priest on May 25th, 1969. He later pursued higher studies in moral theology at the Pontifical University of St Thomas Aquinas (Angelicum) in Rome. In 1973-74 he was Curate at the Parish of St. Brigid in Cabinteely. In 1975 he was responsible for the pastoral care of Dublin pilgrims during the Holy Year in Rome.