Air Marshal Sir Leslie Deane Mavor, KCB, AFC, OStJ, FRAeS, DL (18 January 1916 – 2 October 1991) was a senior Royal Air Force officer.

Educated in Aberdeen, Mavor joined the Royal Air Force in 1935.^[1] He was trained at the School of Army Co-operation and was then posted to No 31 Squadron, which at the time was based in Lahore in India.^[1] In 1942, during the Second World War, Mavor received the Air Force Cross for Army Co-Operation and Transport operations which he performed with his squadron in India, the Middle East and Burma.^[1] In 1959 he became Station Commander at RAF Lindholme and in 1961 he became Director of Air Staff Briefing at the Air Ministry.^[1] In 1964 attended the Imperial Defence College and on graduation he became Air Officer Commanding No 38 Group.^[1] In 1966 he was moved to Assistant Chief of the Air Staff (Policy).^[1] On promotion to air marshal in 1969 he was appointed Air Officer Commanding-in-Chief Training Command and he retired on 18 January 1973.^[1]

Mavor was appointed Principal of the Home Office Home Defence College.^[1] Retiring as Principal in 1980 he continued in the new post of Co-ordinator of Voluntary Effort in Civil Defence until 1984.^[1] His appointment reflected a review of Civil preparedness for home defence carried out by the new Conservative Government in 1979 shortly after it was elected.^[2]

Mavor was made a Companion of the Order of the Bath on 13 June 1964, appointed an Officer of the Order of St John on 30 January 1966, and knighted as a Knight Commander of the Order of the Bath on 1 January 1970.^[1]

He was a Fellow of the Royal Aeronautical Society, and was appointed Deputy Lieutenant of North Yorkshire on 24 May 1976.^[1]