Duncan MacArthur (May 29, 1840 – January 20, 1907[1]) was a Scottish-born businessman, author and political figure in Manitoba.
He was born in Nairnshire, the son of John Macarthur and Sarah Dallas, and was educated at the Free Church Academy there.
MacArthur was married three times: first to Catherine Robertson in 1873, then to Christian Ross in 1876 and finally to Elizabeth, the daughter of James Charles McKeagney in 1886.
[1] He was the author of The Scottish Highlander: his origin, literature, language and general characteristics, published in 1893.
He also published two manuscript histories of the fur trade which are stored in the Manitoba provincial archives.