Guilford Bevil Reed OBE FRSC (November 27, 1887 – February 21, 1955) was a Canadian medical researcher whose research involved diseases such as tuberculosis, gas gangrene, tetanus and rinderpest. Born in Port George, Nova Scotia, he received a B.Sc. in 1912, M.A. in 1913 and Ph.D. in 1915 from Harvard University. From 1915 to 1954, he taught at Queen's University. In 1932, he was elected a Fellow of the Royal Society of Canada and was its president from 1952 to 1953. In 1947, he was awarded the Royal Society of Canada's Flavelle Medal.