Niall Coll KC*HS (born 25 August 1963) is an Irish Roman Catholic prelate and theologian who has served as Bishop of Ossory since 22 January 2023.

[8][3] Following ordination, Coll completed a licentiate in dogmatic theology from the Pontifical Gregorian University in Rome in 1989, before returning to Ireland for his first diocesan assignment, as a teacher at St Eunan's College until 1991.

He subsequently obtained a higher diploma in education from Trinity College, Dublin, in 1992, before returning to Rome to complete doctoral studies in Christology at the Pontifical Gregorian University.

He returned to the Diocese of Raphoe in 1998, serving as curate in Dungloe and simultaneously as chaplain and teacher at Pobalscoil na Rosann.

[17] In conjunction with his priestly appointments, Coll has conducted retreats for clergy, contributed to publications including Doctrine and Life, The Furrow, Irish Theological Quarterly and The Tablet, and edited the Catholic school ethos journal Le Chéile.