Admiral Sir George Hamilton D'Oyly Lyon KCB (3 October 1883 — 19 August 1947) was a distinguished Royal Navy officer as well as an English sportsman who played cricket at first-class level and played rugby union at international level for England, captaining the side in 1909.

The son of George Kenneth Lyon, of the Bengal Civil Service, and his wife, Ellen (daughter of Sir Warren Hastings) he was born in British India at Bankipore in October 1883.

[1] Lyon served throughout the First World War as gunnery officer on board HMS Monarch,[1] during which he was present at the Battle of Jutland.

[1][12] He held the post of Commander-in-Chief, The Nore until July 1943 and retired the following month,[1] having been declared medically unfit for service.

[15] Lyon played his domestic rugby union for the Royal Navy and United Services,[16] He was capped twice at international level for England as a full-back.

[20] He was diagnosed with pulmonary tuberculosis and multiple sclerosis in 1946, with Lyon dying in August 1947 at the King Edward VII Hospital near Midhurst in Sussex.

[17] Following his death, a memorial service was held for him at Chatham Dockyard, which was attended by Admiral Sir Harold Burrough and Air Commodore Alfred Warrington-Morris, amongst others.