General Sir John Chaddesley Westall, KCB, CBE (2 July 1901 – 30 September 1986) was a New Zealand Royal Marines officer who served as Commandant General Royal Marines from 1952 to 1955.

Born in Napier, New Zealand,[3] Westall joined the Royal Marines in 1919.

[4] He served in the Second World War as a Staff Officer in intelligence activities in Singapore and Malaya from 1939 and as a Staff Officer in intelligence activities in India and Burma from 1942, before becoming a Staff Officer at the Director of Naval Intelligence Department in the Admiralty in 1944.

[4] After the war he became commander of the Infantry Training Centre, Royal Marines and then a Staff Officer in intelligence activities in Cape Town from 1947.

[4] He was appointed Chief Staff Officer at Plymouth in 1948, commander of the Royal Marine Barracks at Plymouth in 1949 and commander of the Royal Marine Barracks at Deal in 1950.