William John Vancise (June 19, 1872 - 1935[1]) was a farmer and political figure in Saskatchewan. He represented Lumsden in the Legislative Assembly of Saskatchewan from 1917 to 1925 as a Liberal.
He was born in McIntyre, Ontario, the son of Albert Vancise and Anne McKinnon. In 1901, Vancise married Jennie Campbell. He lived in Grand Coulee, Saskatchewan.[2]