William Samuel Reed (15 November 1864 – 24 April 1941) was a Progressive party member of the Canadian House of Commons. He was born in Harrowsmith Village, Canada West and became a farmer.Reed served as a municipal councillor of Harrowsmith and from 1915 to 1920 was reeve of Portsmouth Township.He was elected to Parliament at the Frontenac riding in the 1921 general election when he defeated John Wesley Edwards of the Conservatives.