Michael James Duff FRS, FRSA is a British theoretical physicist and pioneering theorist of supergravity who is the Principal of the Faculty of Physical Sciences and Abdus Salam Chair of Theoretical Physics at Imperial College London.

Duff completed his Bachelor of Science in Physics Queen Mary College, London in 1969.

He then went on to his Doctor of Philosophy in theoretical physics in 1972 at Imperial College London supervised by the Nobel Laureate Abdus Salam.

He took leave of absence to visit the Theory Division in CERN, first in 1982 and then again as a Staff Member from 1984 to 1987 when he became Senior Physicist.

He is the editor of The World in Eleven Dimensions: Supergravity, Supermembranes and M-theory, ISBN 0-7503-0672-6.,[4] a collection of notable scientific articles on string theory.