Ross Gunn (May 12, 1897 – October 15, 1966) was an American physicist who worked on the Manhattan Project during World War II.
The New York Times described him as "one of the true fathers of the nuclear submarine program".From 1927 to 1947, Gunn worked at the Naval Research Laboratory.
He was the author of over 28 papers, and received 45 patents.
He designed radio devices for controlling aircraft, which were used in the development of the first drones.
He was one of the first to appreciate the possibility of using nuclear power for submarine propulsion.
During World War II he was involved in the development of thermal diffusion technology for isotope separation.
After the war Gunn became director of the Weather Bureau's Physical Research Division, where he carried out a series of studies into atmospheric phenomena.
In 1958 he became a professor of physics at American University, a position he held until his death in 1966.