William Harold Clark (July 1, 1869 – December 27, 1913) was a politician in Alberta, Canada, and a municipal councillor in Edmonton.

William Clark was born in London, England on July 1, 1869. After being educated in London's public schools, he went to work for his father at age sixteen in the building and contracting business.

He moved to Toronto in 1889 and to Edmonton in 1895. In Edmonton, he founded W. H. Clark & Company, which produced sash, doors, and interior furnishings. In this capacity, he did the millwork for many significant buildings, including the Civic Block, the medical building at the University of Alberta, and several hospital units.