James De Mille (23 August 1833 - 28 January 1880) was a professor at Dalhousie University, Nova Scotia, and an early Canadian novelist who published numerous works of popular fiction from the late 1860s through the 1870s. His most popular work with contemporaries, and the work for which he is most known presently, is A Strange Manuscript Found in a Copper Cylinder, which was serialized posthumously in the magazine Harper’s Weekly, and published in book form by Harper and Brothers of New York City, during 1888. Other works included the 1867 historical novel Helena’s Household: A Tale of Rome in the First Century, A Castle in Spain (1869), The American Baron (1872) and The Seven Hills (1873).