| Rooney Sweeney | |
| Position: | Catcher/Outfielder |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | 1 November 1858 |
| Birth Place: | New York, New York |
| Death Date: | Unknown |
| Debutleague: | MLB |
| Debutdate: | July 25 |
| Debutyear: | 1883 |
| Debutteam: | Baltimore Orioles |
| Finalleague: | MLB |
| Finaldate: | June 9 |
| Finalyear: | 1885 |
| Finalteam: | St. Louis Maroons |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .215 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 0 |
| Teams: |
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John J. Sweeney was a catcher and outfielder in Major League Baseball for the 1883 Baltimore Orioles of the American Association, the 1884 Baltimore Monumentals of the Union Association and the 1885 St. Louis Maroons of the National League.