| Károly Dietz | |
| Birth Date: | 21 July 1885 |
| Birth Place: | Sopron, Hungary |
| Death Place: | Budapest, Hungary |
| Clubs1: | Magyar AC |
| Clubs2: | Műegyetemi AFC |
| Manageryears1: | 1934–1939 |
| Managerclubs1: | Hungary |
Károly Dietz (21 July 1885 – 9 July 1969) was a Hungarian football player and manager who coached Hungary in the 1938 FIFA World Cup.[1] He was the national football team's manager from 1934 to 1939. Dietz also played for Magyar AC and Műegyetemi AFC.