| Jack Wadsworth | |
| Position: | Pitcher |
| Birth Date: | 17 December 1867 |
| Birth Place: | Wellington, Ohio |
| Death Place: | Elyria, Ohio |
| Bats: | Left |
| Throws: | Right |
| Debutleague: | MLB |
| Debutdate: | May 1 |
| Debutyear: | 1890 |
| Debutteam: | Cleveland Spiders |
| Finalleague: | MLB |
| Finaldate: | April 29 |
| Finalyear: | 1895 |
| Finalteam: | Louisville Colonels |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 6 - 38 |
| Stat2label: | Innings pitched |
| Stat2value: | 367⅔ |
| Stat3label: | Earned run average |
| Stat3value: | 6.85 |
| Teams: | |
John L. Wadsworth (December 17, 1867 - July 8, 1941) was an American Major League Baseball pitcher who played for four seasons. He played for the Cleveland Spiders in 1890, the Baltimore Orioles in 1893, and the Louisville Colonels from 1894 to 1895.[1]