Vice-Admiral Warren Hastings D'Oyly (3 August 1867 – 22 March 1950) was a British officer of the Royal Navy who saw service in the First World War.

Warren Hastings D'Oyly was born on 3 August 1867, the third son of Warren Hastings D'Oyly, later tenth Baronet, who worked in the Bengal Civil Service, and his wife Henrietta Mary Halliday, a daughter of Sir Frederick James Halliday, Lieutenant-Governor of Bengal.

They had one son: Lieutenant Reginald Clare Hastings D'Oyly (1918–1941), who served in the Royal Navy during the Second World War and died on 31 March 1941, while stationed on HMS Bonaventure, which was sunk south of Crete.

[6] He served in the South African War 1899–1902, in command of the composite gunboat HMS Thrush.

For his service he was mentioned in despatches by the commander of the British force during the war, and by the High Commissioner of other Nigeria.