John Christopher "Aidan" Nichols OP[1] (born 17 September 1948) is an English academic and Catholic priest.

He is a member of the Order of Preachers (Dominicans) residing in the Priory of St Michael the Archangel in Cambridge, England.

He graduated with first-class honours from Christ Church, Oxford, with a degree in modern history.

[2] Between 1983 and 1991, Nichols was Lecturer in Dogmatics and Ecumenics at the Pontifical University of St. Thomas Aquinas in Rome.

Nichols began his academic work in the Russian theological tradition and has written on many figures, including Sergei Bulgakov.