William Tremblay (August 10, 1877 – November 15, 1973) was a politician in Quebec, Canada and a Member of the Legislative Assembly of Quebec (MLA).^[1]

He was born on August 10, 1877, in Chicoutimi.

Tremblay ran as a Labour candidate in the district of Maisonneuve in the 1925 federal election and finished a distant third against Liberal incumbent Clément Robitaille.

He ran as a Labor candidate in the district of Maisonneuve in the 1927 provincial election and won. He finished a distant third in the 1931 election and was defeated by Liberal candidate Charles-Joseph Arcand.

Tremblay was re-elected as a Conservative candidate in the 1935 election. He joined Maurice Duplessis's Union Nationale and was re-elected in the 1936 election.

He served as Minister of Labour from 1936 until the 1939 election, when he was defeated by Liberal incumbent Joseph-Georges Caron.

Tremblay ran as a Progressive Conservative candidate in the district of Maisonneuve—Rosemont in the 1945 federal election. He finished third against Liberal candidate Sarto Fournier.

He died on November 15, 1973.