Isaac Buchanan (July 21, 1810 – October 1, 1883) was a businessman, political figure and writer in Upper Canada, then Canada West, Province of Canada (now Ontario). Born in Glasgow, Scotland, he emigrated to British North America in 1830, settling first in Montreal, then York (now Toronto), and then Hamilton. At the height of his business career, he had an extensive house and estate in Hamilton, which he named "Auchmar", in recognition of his Clan Buchanan roots in Scotland.