John Mastel

{{Short description|British police officer}}

{{Use dmy dates|date=February 2025}}

{{Use British English|date=December 2017}}

Royston John Mastel CVO CBE (30 May 1917 – 7 April 1998) was a British police officer in the London Metropolitan Police.

Mastel was educated at Tottenham Grammar School and joined the Metropolitan Police as a Constable in 1937. He served as a pilot in the Royal Air Force Volunteer Reserve from 1941 to 1945, being commissioned from the rank of Flight Sergeant in May 1944{{London Gazette |issue=36612 |date=14 July 1944 |page=3337 |supp=y}} and promoted Flying Officer in November 1944.{{London Gazette |issue=36852 |date=19 December 1944 |page=5873 |supp=y}} Rejoining the police, he was promoted Sergeant in 1946, Inspector in 1951, and Superintendent in 1955. In 1966 he was promoted Commander and made second-in-command of No.2 District. He was appointed Commander of the Order of the British Empire (CBE) in the 1969 Birthday Honours, having been promoted Deputy Assistant Commissioner (Personnel).{{London Gazette |issue=44863 |date=6 June 1969 |page=5969 |supp=y}}

In 1972, he was appointed Assistant Commissioner "D" (Personnel and Training)"Administrator is new London CID chief", The Times, 12 February 1972{{London Gazette |issue=45656 |date=25 April 1972 |page=4912 }} and in October 1972 he took over as Assistant Commissioner "A" (Operations and Administration)."Yard man to be Chief Inspector of Constabulary", The Times, 25 October 1972 He retired on 31 December 1976"Police retirement", The Times, 15 December 1976 and was appointed Commander of the Royal Victorian Order (CVO) in the 1977 Birthday Honours.{{London Gazette |issue=47234 |date=10 June 1977 |page=7084 |supp=y}}