| Sir William Beloe | |
| Birth Date: | 9 December 1909 |
| Death Date: | 3 April 1966 (aged 56) |
| Allegiance: |  United Kingdom |
| Serviceyears: | 1923–1966 |
| Rank: | Vice-Admiral |
| Branch: | Royal Navy |
| Commands: | HMS Campbeltown HMS Cotton HMS Contest HMS Dainty HMS Ocean |
| Battles: | World War II |
| Awards: | Knight Commander of the Order of the British Empire Companion of the Order of the Bath Distinguished Service Cross |
Vice-Admiral Sir Isaac William Trant Beloe (9 December 1909 – 3 April 1966) was a Royal Navy officer who became Deputy Supreme Allied Commander Atlantic.
Beloe joined the Royal Navy in 1923.[1] He served in World War II commanding the destroyer HMS Campbeltown and frigate HMS Cotton in the Western Approaches, Western Mediterranean and Russian convoys.[1] After the War he commanded the destroyer HMS Contest and then became Deputy Director of the Royal Navy Staff College before commanding the destroyer HMS Dainty and then the aircraft carrier HMS Ocean.[1] He was appointed Commodore commanding the Pakistan Flotilla in 1957, Commodore in charge of the Royal Navy Barracks, Devonport in 1959 and Flag Officer, Medway and Admiral Superintendent, Chatham in 1961.[1] He was promoted to vice-admiral on 30 May 1963. His last appointment was as Deputy Supreme Allied Commander Atlantic in 1964 before his sudden death from a heart attack as he left his home in 1966.[2]