| Honorific Prefix: | Admiral |
| Sir John Frewen | |
| Honorific Suffix: | GCB |
| Birth Date: | 1911 3, df=y |
| Death Date: | [1] |
| Allegiance: |  United Kingdom |
| Rank: | Admiral |
| Commands: | HMS Mounts Bay Home Fleet Channel Portsmouth Naval Home Command |
| Battles: | World War II Korean War |
| Awards: | Knight Grand Cross of the Order of the Bath |
Admiral Sir John Byng Frewen, GCB (28 March 1911 – 1 September 1975) was Commander-in-Chief Naval Home Command.
Frewen joined the Royal Navy in 1924.[2] He served in World War II in the Russian Convoys and as squadron navigating officer for aircraft carriers in the Pacific.[2] He also served in the Korean War as commander of HMS Mounts Bay.[3]
He was appointed chief of staff to the commander-in-chief, Home Fleet, in 1959 and then became Flag Officer Second in Command Far East Fleet in 1961.[2] He went on to be Vice Chief of the Naval Staff in 1963 and commander-in-chief, Home Fleet, in 1965.[2] He was then appointed Commander-in-Chief, Portsmouth, in 1967.[2] Finally he was appointed the first Commander-in-Chief Naval Home Command (following the merger of the Portsmouth and Plymouth Commands) in 1969.[2] In that capacity he welcomed Sir Alec Rose back to Portsmouth after his single-handed trip around the world.[4] Frewen was also First and Principal Naval Aide-de-Camp to the Queen from 1968 to 1970. He retired in 1970.[2]
In retirement Frewen transferred Brickwall House School, a specialist school for boys with dyslexia, into an educational trust, which, after his death, was renamed by his cousin and godson Jonathan Frewen as Frewen College.[5] In 1972 he was Chairman of the Royal Navy Club of 1765 & 1785 (United 1889).[6]
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