| Jack Harper | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | August 5, 1893 |
| Birth Place: | Hendricks, West Virginia |
| Death Place: | Halstead, Kansas |
| Debutleague: | MLB |
| Debutdate: | April 17 |
| Debutyear: | 1915 |
| Debutteam: | Philadelphia Athletics |
| Finalleague: | MLB |
| Finaldate: | April 26 |
| Finalyear: | 1915 |
| Finalteam: | Philadelphia Athletics |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0–0 |
| Stat2label: | Strikeouts |
| Stat2value: | 3 |
| Stat3label: | Earned run average |
| Stat3value: | 3.12 |
| Teams: |
|
John Wesley Harper (August 5, 1893 – June 18, 1927) was an American pitcher in Major League Baseball. He pitched in three games for the Philadelphia Athletics in .
He was born in Hendricks, West Virginia, and died in Halstead, Kansas.