New Castle County John Doe may refer to:
- New Castle County John Doe (June 1934)
- New Castle County John Doe (July 20, 1934)
- New Castle County John Doe (July 25, 1934)
- New Castle County John Doe (1883)
- New Castle County John Doe (1902)
- New Castle County John Doe (1972)
- New Castle County John Doe (1978)
- New Castle County John Doe (January 1991)
- New Castle County John Doe (1993)
- New Castle County John Doe (1994)
- Franklin McClellan, a man who was found in 1997 and identified in 2017.