Joseph P. Moran (1895–1934) was an American doctor known for catering to the Depression-era criminal underworld in the early 20th century. He was also a peripheral member of the Barker-Karpis gang, and was possibly the last physician to see the mortally wounded John Hamilton, a member of the John Dillinger gang, whom Moran refused to treat. Moran disappeared in July 1934. He is believed to have been murdered by Fred Barker and Alvin Karpis.