William Sawyer (November 25, 1815 – January 11, 1904) was a lumber merchant and political figure in Quebec.
He represented Compton in the Legislative Assembly of Quebec from 1871 to 1886 as a Conservative.
He was born in Sawyerville, Quebec, the son of John Sawyer.
His grandfather, Josiah Sawyer, after whom Sawyerville was named, was originally from Massachusetts and received a large land grant in Eaton Township.
Sawyer owned sawmills and grist mills.
He was a member of the council for Eaton Township from 1855 to 1872, serving as mayor, and was warden for Compton County.