| Honorific Prefix: | Lieutenant-Colonel |
| Sir Francis D'Oyly | |
| Birth Date: | 8 November 1776[1] |
| Birth Place: | Marylebone, London, England |
| Branch: | British Army |
| Rank: | Lieutenant colonel |
| Battles: | |
Lieutenant-Colonel Sir Francis D'Oyly (8 November 1776 – 18 June 1815) was a British Army officer. He was the third son of Matthias and Mary D'Oyly and younger brother of Sir John D'Oyly, 1st Baronet.[2]
Commissioned into the 1st Regiment of Guards, D'Oyly served with them during the 1799 Anglo-Russian expedition to the Netherlands in 1799. He returned to the Netherlands in the Walcheren Campaign of 1809. On 2 July 1811, both he and his brother Henry were promoted from captains to majors in the army. On 6 October 1812, he was given command of a company in the Guards as a brevet major after the death of Lt-Col. Colquitt. He then served under the Duke of Wellington in the British Army's campaign in the Spanish Peninsula and France, after which he was made a KCB. He again served under Wellington during the Hundred Days and was killed at the battle of Waterloo.