Admiral Sir David John Hallifax, (3 September 1927 – 23 August 1992) was a senior Royal Navy officer who served as Constable and Governor of Windsor Castle from 1988 until 1992.

Hallifax was educated at Winchester College, joined Britannia Royal Naval College, Dartmouth as a cadet in 1945 and spent his early years in minesweepers based in the eastern Mediterranean. His first command was as a young lieutenant in the fast patrol boat MTB5008.

In 1954 Hallifax qualified as a Torpedo and Anti-Submarine Officer serving in during the Suez Crisis in 1956 and later in in the West Indies. He also commanded the destroyer He was a keen yachtsman, competing in the 1971 Admirals Cup aboard the 'Prospect of Whitby'. He was a skilled woodworker, with a particular interest in fine reproduction furniture. He died of motor neurone disease in 1992.

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