| John Dietz | |
| Birth Date: | 24 November 1870 |
| Birth Place: | Germany |
| Death Place: | New York, New York, United States |
| Sport: | Sport shooting |
| Show-Medals: | yes |
John A. Dietz (November 24, 1870 - October 11, 1939) was an American sport shooter who competed at the 1908 Summer Olympics and the 1912 Summer Olympics. He won two gold medals as part of the American pistol team.[1]
In 1908, he also competed in the individual pistol event and finished ninth. In 1912 he finished fourth in the 30 metre military pistol team event. He also competed in the 30 metre rapid fire pistol event finishing fourth and in the 50 metre pistol finishing again ninth.[2]