Hugh Aylmer Dempsey, CM (November 7, 1929 - May 24, 2022) was a Canadian historian, an author and the Chief Curator Emeritus of the Glenbow Museum in Calgary, Alberta. Dempsey authored more than 20 books, focusing primarily on the history of people of the Blackfoot Confederacy. He received an honorary doctorate from the University of Calgary and was made an honorary chief of the Kainai Blackfoot in 1967. For his contributions to the study of the Plains Indians, Dempsey was awarded membership in the Order of Canada in 1975.