Peter Duff Hart-Davis (born 1936), generally known as Duff Hart-Davis, is a British biographer and journalist, who writes (or wrote?) for The Independent newspaper.

He is the elder son of the publisher Sir Rupert Hart-Davis (1907 - 1999), and hence the elder brother of the television broadcaster and author Dr. Adam Hart-Davis. His sister is married to the present Lord Silsoe.

Duff Hart-Davis is married to Phyllida Barstow, and has one son and one daughter.

His godfather was the adventurer and writer Peter Fleming (1907 – 1971), whose life was written up by Duff Hart-Davis as Peter Fleming: A Biography, published in 1974.

Sources:

• http://www.angelfire.com/realm/gotha/index.html

Theroff Files (j1d.txt) by Paul Theroff, listing descendants of King James VI & I of England and Scotland.