| John Nunn | |
| Fullname: | John Hamann Nunn |
| Birth Place: | Terre Haute, Indiana, U.S. |
| Headercolor: | lightsteelblue |
| Show-Medals: | yes |
John Hamann Nunn (born October 12, 1942) is an American rower who competed in two Olympics. He won a bronze medal in the 1968 Summer Olympics with his partner Bill Maher in the double sculls event. He went on to coach the 1976 Olympic U.S. rowing team in Montreal placing 5th.
He was born in Terre Haute, Indiana. He lives in California and is married and has five children.