William Stephen Bullock (3 August 1865 – 13 November 1936) was a Canadian Baptist minister, businessman, and politician.
Born in Sainte-Pudentienne near Shefford, Canada East, the son of William Henry Bullock, a farmer, and Hanna Chartier, Bullock studied at the mission of Grande-Ligne, the Montreal Normal School, McGill University, and Andover Newton Theological School in Massachusetts.
He ordained a Baptist minister in Ottawa on 18 February 1892.