Sir Ian David Macfadyen, KCVO, CB, OBE, FRAeS (born 19 February 1942) is a senior Royal Air Force officer, a former Lieutenant Governor of the Isle of Man (2000–05) and Constable and Governor of Windsor Castle (2009–14).

29 Squadron flying F4 Phantom aircraft at RAF Coningsby with whom he saw operational service in the Falkland Islands,[2] and Officer Commanding of No.

[1] In 1985 as a group captain he was Station Commander at RAF Leuchars in Fife He was at the Royal College of Defence Studies in 1988.

In 1994 he was promoted to Air Marshal and became Director General of the Saudi Arabia Armed Forces Project in Riyadh.

In October 2009 Macfadyen became Constable and Governor of Windsor Castle in succession to Vice Admiral Ian Jenkins.