Stanley William Farquhar (February 24, 1916 – May 30, 1992) was a politician in Ontario, Canada.
He was a Liberal member of the Legislative Assembly of Ontario from 1963 to 1971 who represented the riding of Algoma—Manitoulin.
He was general manager of Thomas Farquhar and Sons, which produced dairy products and ice cream.
Farquhar served on the local school board and was mayor of Little Current.
In 1963, Farquhar ran as the Liberal candidate in the northern Ontario riding of Algoma—Manitoulin.