Donald Gunn (September 1797 – 30 November 1878) was a Scottish-Canadian businessman, judge, astronomer and politician.
Donald (Manitoba) Gunn married Margaret Swain (who was born in Rupert's Land) in 1819; they had many children.
Donald had a brother called William Gunn of Waranga, Victoria, Australia.
Donald worked in the Canadian North West for the Hudson's Bay Company between 1813 and 1823, and was subsequently a Judge on the Court of Petty Sessions in Red River.
In Manitoba's first general election (27 December 1870), he ran against Provincial Secretary and fellow Archibald-supporter Alfred Boyd.