William Dell Perley (February 6, 1838 – July 15, 1909) was a farmer and politician from western Canada.

William had an extensive political career, he ran at least twice for the House of Commons of Canada in Sunbury electoral district as a Conservative being defeated both times in 1878 and 1882 in hotly contested and very close elections.

He resigned his territorial seat two years prior to running in the 1887 Canadian federal election when he won one of the first Northwest Territories seats in the House of Commons of Canada.

Perley served in the House of Commons for a year before being appointed to the Senate of Canada on the advice of John A. Macdonald.

He served as a Senator for the Northwest Territories, and then the province of Saskatchewan after it was created in 1905.