Mary Stuart Gile (née Sinclair; March 24, 1936 – October 15, 2019) was a Canadian-born American politician from New Hampshire. Born and raised in Montreal, Quebec, Canada, she attended public schools, and graduated from McGill University with a B.Sc. in physical education, health and recreation. She moved to the United States and became a naturalized United States citizen in 1969. She worked for the State of New Hampshire for 16 years, acquiring her M.Ed. from the University of New Hampshire and an Ed.D. in educational leadership from Vanderbilt University's George Peabody College. She married her second husband, Robert "Bob" Gile, becoming stepmother to his son, Jack. In 1976, the couple had a child together, Robert.