| Position | Pitcher |
|---|---|
| Birth date | October 3, 1874 |
| Birth place | Freeport, Illinois |
| Death date | February 15, 1954 (aged 79) |
| Death place | Oklahoma City, Oklahoma |
| Debutleague | MLB |
| Debutdate | September 3 |
| Debutteam | St. Louis Browns |
| Finalleague | MLB |
| Finaldate | September 4 |
| Finalteam | St. Louis Browns |
| Statleague | MLB |
| Stat1label | Win–loss record |
| Stat1value | 0-2 |
| Stat2label | Strikeouts |
| Stat2value | 2 |
| Stat3label | Earned run average |
| Stat3value | 16.20 |
| Teams |
|
John William Callahan (October 3, 1874 – February 15, 1954) was an American Major League Baseball pitcher. He played for the St. Louis Browns during the season.