Frances Gertrude McGill (November 18, 1882 – January 21, 1959) was a Canadian forensic pathologist, criminologist, bacteriologist, allergologist and allergist. Nicknamed "the Sherlock Holmes of Saskatchewan" for her deductive skills and public fame, McGill influenced the development of forensic pathology in Canadian police work and was internationally noted for her expertise in the subject.
After completing her medical degree at the University of Manitoba in 1915, McGill moved to Saskatchewan, where she was hired first as the provincial bacteriologist and then as the provincial pathologist. She worked extensively with the Royal Canadian Mounted Police (RCMP) and local police forces for more than thirty years, and was instrumental in establishing the first RCMP forensic laboratory. She directed the RCMP laboratory for three years, and trained new RCMP recruits in forensic detection methods. After retiring in 1946, McGill was appointed Honorary Surgeon for the RCMP by the Canadian Minister of Justice, becoming one of the first official female members of the force, and she continued to act as a consultant to the RCMP until her death in 1959.