Douglas Thomas Fearon (born 16 October 1942) is an American medical immunologist, who has been since 2003 Sheila Joan Smith Professor of Immunology at the University of Cambridge, a fellow of Trinity College, Cambridge, and a professor at Cold Spring Harbor Laboratory.
Fearon was elected a Fellow of the Royal Society (FRS) in 1999 and is also member of the United States National Academy of Sciences. His nomination for the Royal Society reads: