Admiral William Waldegrave, 1st Baron Radstock, GCB (9 July 1753 – 20 August 1825) was an officer in the Royal Navy and Governor of Newfoundland.

At the start of the French Revolutionary War Waldegrave commanded HMS Courageux under Samuel Hood, 1st Viscount Hood at Toulon and later HMS Barfleur under John Jervis, 1st Earl of St Vincent in the Mediterranean where he was third in command at the Battle of Cape St Vincent in 1797.

During Waldegrave's time as governor, he was chiefly concerned with military matters, as a French squadron had burned Bay Bulls just a year prior, and Newfoundland was still quite exposed.

Waldegrave made several attempts to restrict the power of the merchants on Newfoundland, and also to bring law and order to the island.

Waldegrave was created a peer as Baron Radstock, of Castletown in the Queen's County in the Peerage of Ireland in 1800 on the completion of his term as Governor of Newfoundland.