Air Marshal Iain Walter McNicoll, CB, CBE, FRAeS (born 3 May 1953) is a retired Royal Air Force officer. He was formerly Deputy Commander-in-Chief Operations, RAF Air Command.

Educated at the High School of Dundee and the University of Edinburgh, where he gained a Bachelor of Science, and having been in the East Lowlands Universities Air Squadron McNicoll joined the Royal Air Force Flying Branch in 1975.^[1]

He was appointed Officer Commanding No. 17(F) Squadron in 1992^[1] and assistant director of Operational Capability at the Ministry of Defence in 1996. He went on to be Personal Staff Officer to the Chief of the Defence Staff in 1997^[1] and Station Commander RAF Brüggen in 1998 in which role had operational control of the base's Tornado aircraft during 1999 NATO bombing of Yugoslavia.^[1]

He became Director of Force Development in 2000,^[1] Director-General of Joint Doctrine and Concepts in 2002^[1] and Air Officer Commanding No. 2 Group in 2005.^[1] His last appointment was as Deputy Commander-in-Chief (Operations) at Air Command in 2007,^[1] in which role he had to defend the airworthiness of his ageing aircraft,^[2] before he retired in April 2010.

He married Wendelien van den Biggelaar, a Dutch citizen, in 1980: they have one son and two daughters.^[1]