John Christopher "Aidan" Nichols op (born in Lytham St Annes, Lancashire on17 September 1948) is an academic and Catholic priest, member of the Order of Preachers (Dominicans).
He graduated from Christ Church, Oxford with a first in modern history and entered the Dominicans order the same year. He spent the next seven years at Blackfriars, Oxford, during which time he was ordained to the priesthood. He then moved to Edinburgh, where he was a Catholic chaplain at the University of Edinburgh. It was at Edinburgh in 1986 that he received his PhD. Between 1983 and 1991 he was Lecturer in Dogmatics and Ecumenics at the Pontifical University of St Thomas d'Aquinas (Angelicum) in Rome. In 1990 he was awarded the degree of Licentiate in Sacred Theology from the Angelicum. In 2003 the Master of the Dominican Order conferred on Nichols the degree of Master in sacred Theology.
From Rome he moved back to England and to Cambridge, where he began as Assistant Catholic Chaplain, then as an Affiliated University Lecturer (1998) and finally as Prior of St Michael's (1998-2004; 2013-).He served as the first John Paul II Memorial Visiting Lecturer at the University of Oxford for 2006 to 2008, the first lectureship of Catholic theology at that university since the Reformation.