Douglas Dale Northway (born 28 April 1955) is an American former pool and open water swimmer who represented the United States at the 1972 Munich Olympic Games and 1976 Montréal Olympic Games and made the USA Olympic Swim Team that never participated in the 1980 Moscow Olympic Games. As a 17-year-old high school student at the 1972 Munich Olympics, Northway received a bronze medal in the 1500m freestyle (16:09.25). At the 1976 Montreal Olympics, he swam for the gold medal-winning U.S. team in the preliminary heats of the 800m freestyle relay.
Northway was a high school student in Sahuaro High School, Arizona when he dropped his 1500m time by 45 seconds between the 1971 AAU National Championships and the 1972 USA Olympic Swimming Trials. He also won the 400m freestyle at the 1975 Pan American Games while he was a student at the University of Arizona.
Northway later became a professional marathon swimmer and swimming coach.
He won the 30th Traversée internationale du lac St-Jean on 29 July 1984 from Péribonka, Roberval (32 km) in 7 hours 37 minutes and second at the 1984 Traversée Internationale du lac Memphrémagog in Quebec, Canada, and the 24-mile Cabo San Lucas professional marathon swim in 1984.