Second World War Captain Guy D'Oyly-Hughes DSO & Bar, DSC (8 August 1891 – 8 June 1940) was an officer in the Royal Navy.

During the First World War, Lieutenant D'Oyly-Hughes was a submariner and second in command of HMS E11, which was highly successful in the Dardanelles Campaign.

D'Oyly-Hughes was awarded the DSC after swimming ashore from E11 with explosives and blowing up part of the Constantinople-Baghdad Railway on 21 August 1915.

D'Oyly-Hughes had learned to fly and continually rejected the advice of the ship's professional aviators, according to Winton.

Winton describes D'Oyly-Hughes' lack of belief in the effectiveness of air patrols and the questions raised by numerous commentators, including eyewitnesses from Glorious and Scharnhorst,[6] about the captain's judgement in this and other matters.