William Henry Forbes (C. 1815 – July 20, 1875) was an American fur trader and territorial legislator.
Born in Montreal, Lower Canada, Forbes settled in Wisconsin Territory in 1837.
Forbes worked for the American Fur Company, St. Paul Outfit.
During the Dakota War of 1862, Forbes served in the United States Army as a quartermaster and commissary.
His father-in-law was Alexander Faribault, who also served in the Minnesota Territorial Legislature.