| Jack Katoll | |
| Bats: | Left |
| Throws: | Right |
| Birth Date: | 24 June 1875 |
| Birth Place: | Finckenstein, Prussia |
| Death Place: | Woodstock, Illinois, U.S. |
| Debutleague: | MLB |
| Debutdate: | September 9 |
| Debutyear: | 1898 |
| Debutteam: | Chicago Orphans |
| Finalleague: | MLB |
| Finaldate: | September 29 |
| Finalyear: | 1902 |
| Finalteam: | Baltimore Orioles |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 17–22 |
| Stat2label: | Earned run average |
| Stat2value: | 3.32 |
| Stat3label: | Strikeouts |
| Stat3value: | 90 |
| Teams: |
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Johann "Jack" Katoll (June 24, 1875 – June 18, 1955) was a professional baseball pitcher who played in the Major Leagues from 1898 to 1902. He would play for the Chicago Orphans, Chicago White Sox, and Baltimore Orioles.