Donald Laverne Katz (August 1, 1907 near Jackson, Michigan – May 29, 1989 Ann Arbor, Michigan) was an American chemist and chemical engineer. The 1983 National Medal of Science was presented to Katz by President Ronald Reagan "for solving many practical engineering problems by delving into a wide group of sciences and making their synergistic effects evident." Katz was also noted for developing a hazard rating system for dangerous bulk cargoes. The New York Times called Katz an "oil expert". The National Academy of Engineering called him a "world leader" in reservoir engineering.