Nicholas John Seymour Mackintosh, FRS[3] (9 July 1935 – 8 February 2015)[3][2] was a British experimental psychologist and author, specialising in intelligence, psychometrics and animal learning.

He was educated at Winchester College[2] and the University of Oxford where he was a student of Magdalen College, Oxford and obtained a Bachelor of Arts degree in 1960, followed by a Doctor of Philosophy degree in 1963 supervised by Stuart Sutherland.

[2] From 1967 until 1973 he held a Killiam Professorship at Dalhousie University in Halifax, Canada.

[3] He was, until his death, Emeritus Professor of Experimental Psychology as well as Distinguished Associate in the Psychometrics Centre in the University of Cambridge.

He died in Bury St Edmunds at the age of 79 on 8 February 2015 after a short illness.