| Johnny Mann | |
| Position: | Pinch hitter/Third baseman |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | February 4, 1898 |
| Birth Place: | Fontanet, Indiana |
| Death Place: | Terre Haute, Indiana |
| Debutleague: | MLB |
| Debutdate: | April 18 |
| Debutteam: | Chicago White Sox |
| Finalleague: | MLB |
| Finaldate: | May 23 |
| Finalteam: | Chicago White Sox |
| Statleague: | MLB |
| Stat1label: | Games played |
| Stat1value: | 6 |
| Stat2label: | At bats |
| Stat2value: | 6 |
| Stat3label: | Hits |
| Stat3value: | 3 |
| Teams: | |
John Leo Mann (February 4, 1898 – March 31, 1977) was an American Major League Baseball player who played for the Chicago White Sox in . He was used as a pinch hitter and a third baseman.