Frederick George Keyes (June 24, 1885 – April 14, 1976) was an American physical chemist. Keys was most notable for inventing a method to sterilize milk using ultra-violet rays, and discovering that ultra-violet rays kill germs. According to the National Academies Press Keys was also notable for "advances in thermodynamics, equations of state of gases, and thermodynamic properties, in particular liquid water and steam". Keyes was Head of Department of Chemistry at MIT, and a member of the National Academy of Sciences