William Curtis Colepaugh (March 25, 1918 – March 16, 2005) was an American who, following his 1943 discharge from the US Naval Reserve ("for the good of the service", according to official reports), defected to Nazi Germany in 1944.
While a crewman on a repatriation ship that stopped off in Lisbon, Colepaugh defected at the German consulate.
Colepaugh had attended Admiral Farragut Academy in Pine Beach, New Jersey.