William Henry Isaac Atkinson DSC, CD (born 22 April 1923) was the highest scoring fighter ace of the Royal Canadian Navy during the Second World War and the last pilot from The Commonwealth to become an ace during the war. Atkinson claimed five aircraft destroyed and two shared. During the war he was awarded the Distinguished Service Cross and was Mentioned in Despatches. Remaining in the navy after the war he was awarded the Canadian Forces Decoration and clasp.