William Delday (July 25, 1913 – December 11, 1979) was a politician from Alberta, Canada.
He served in the Legislative Assembly of Alberta from 1959 to 1967 as a member of the Social Credit caucus in government.
He stood as the Social Credit candidate in the electoral district of Bow Valley-Empress.
He defeated incumbent MLA Bryce Stringam by a comfortable majority to pick up the seat for his party.
[3] In the 1963 general election Delday won a three-way race with a large majority.