John Urquhart (1844 – December 17, 1933) was a medical doctor and mayor of Oakville, Ontario, Canada from 1888 to 1891.
At age sixteen, Uquhart ran away from home and worked as a sailor aboard Great Lakes ships. He subsequently worked as a farmer before embarking on a medical career. He studied at the Rolph School of Medicine in Toronto, University of Trinity College, and the Royal College of Physicians of Edinburgh.
Urquhart served as mayor of Oakville for two terms from 1888 to 1891.