Charles Macdonald (19 July 1828 – 11 March 1901) was a Scottish-Canadian mathematician and educator. Born in Aberdeen, Scotland, Macdonald studied at King's College, Aberdeen, earning degrees in the arts and divinity. The Church of Scotland named Macdonald the chair in mathematics at Dalhousie College in Halifax, Nova Scotia, which he held until his death in 1901. He was an advocate for education reform in Nova Scotia, and was a significant presence for Dalhousie in Halifax. Dalhousie's first library, Macdonald Memorial Library, was named in his honour by former students who raised money to build it.