William Williams VC, DSM & Bar (5 October 1890 – 22 October 1965), was a Welsh recipient of the Victoria Cross, the highest and most prestigious award for gallantry in the face of the enemy that can be awarded to a member of the British and Commonwealth armed forces.

He was from Amlwch on Anglesey and at age 26 was serving as a seaman in the Royal Naval Reserve during the First World War when the following deed took place: The Pargust's 'panic party', the decoy crew carried on every Q ship for the purpose of leaving it apparently abandoned when attacked, took to the lifeboats and the U-boat then surfaced, believing the Pargust to be a crewless and defenceless merchant vessel.

When the U-boat was about 50 yards (46 m) away, the captain of HMS Pargust gave the order to fire and the submarine was blown up and sank.

In the case of a gallant and daring act in which all men are deemed equally brave and deserving of the Victoria Cross a secret ballot is drawn.

[1]The King has been graciously pleased to approve of the award of the following honours, decorations and medals to Officers and men for services in action with enemy submarines: - To receive the Victoria Cross.