|Born||30 December 1918|
|Died||26 August 1981(aged 62)|
|Service/||Royal Air Force|
|Years of service||1938–1974|
|Rank||Air Vice Marshal|
|Commands held||No. 214 Squadron (1946–1948)|
RAF Bassingbourn (1958–1961)
No. 19 Group (1968–1969)
|Battles/wars||Second World War|
|Awards||Companion of the Order of the Bath|
Commander of the Order of the British Empire
Mentioned in Despatches
Susan Pelham (m. 1940–1981)
|Relations||Cecil Clementi (father) |
Marie Penelope Rose Eyres (mother)
Clementi was the son of Cecil Clementi and Marie Penelope Rose Eyres. He was born on 20 December 1918 in British Guiana during his father's posting there as Colonial Secretary (1913–1922). He joined the Royal Air Force Volunteer Reserve in 1939, and was granted a permanent commission in the RAF in 1946. He attended the British nuclear tests in 1958 at Christmas Island. He retired in 1974. He was Master of the Mercers' Company in 1977. 
Clementi married Susan Pelham (1918–2006) in 1940 and had three children:
- Christopher Pelham Clementi (1943–)
- Nancy Clementi (1946–) – married Peter Lambert Tribe in 1972
- Sir David Clementi (1949–) – British banker and recently[when?] stepped down as chairman of Prudential plc.
- "Survey of the Papers of Senior UK Defence Personnel, 1900–1975". King's College London.
- "Air of Authority – A History of RAF Organisation AVM C M Clementi". RAF.
- "Letter from the Headmaster" (PDF). The Abingdonian.