| Jack Barnett | |
| Position: | Outfielder |
| Bats: | Both |
| Throws: | Unknown |
| Birth Date: | December 16, 1879 |
| Birth Place: | Ventura, California, U.S. |
| Death Place: | Modoc County, California, U.S. |
| Debutleague: | MLB |
| Debutdate: | July 2 |
| Debutyear: | 1907 |
| Debutteam: | St. Louis Cardinals |
| Finalleague: | MLB |
| Finaldate: | September 20 |
| Finalyear: | 1907 |
| Finalteam: | St. Louis Cardinals |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .238 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 12 |
| Teams: |
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John Jeirus Barnett (December 16, 1879 – September 3, 1923) was an American professional baseball player who played outfielder in the major leagues for the 1907 St. Louis Cardinals. He died after being accidentally shot while hunting.[1]