William Arthur Summerville (July 8, 1879 – November 19, 1958) was a municipal and provincial politician in Ontario, Canada.
He was a Progressive Conservative member of the Legislative Assembly of Ontario from 1937 to 1943 who represented the downtown Toronto riding of Riverdale.
Summerville was born in Cargill, Bruce County on July 8, 1879 and moved with his family to Toronto at age three.
His election caused controversy when it was discovered he was on arrears on some of his municipal taxes, and was thus ineligible to run and to take his seat on the board.
Donald's older brother William's grandson Paul Summerville was an NDP candidate in the 2006 federal election.