Louis Dega (born 1890, Marseilles, France – died 1945, French Guiana) was a prisoner in the French Guiana penitentiary of Devil's Island. He was convicted of fraud and counterfeiting and sentenced to fifteen years' imprisonment by France, where he became a companion of Henri Charrière (also known as Papillon) for thirteen years. The two were first sent to a prison in Caen, France, until they embarked for South America in 1932. He had a younger brother named Joseph who tried to help Charrière escape from Barranquilla prison in Colombia. Dega and Papillon had previously met before embarking to South America, and made a deal in which Dega paid Papillon for protection. The two became best friends during their sentence.