| Pop Joy | |
| Position: | First baseman |
| Birth Date: | 11 June 1860 |
| Birth Place: | Washington, D.C. |
| Death Place: | Washington, D.C. |
| Bats: | Unknown |
| Throws: | Unknown |
| Debutleague: | MLB |
| Debutdate: | June 11 |
| Debutyear: | 1884 |
| Debutteam: | Washington Nationals |
| Finalleague: | MLB |
| Finaldate: | September 24 |
| Finalyear: | 1884 |
| Finalteam: | Washington Nationals |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat2label: | Hits |
| Stat3label: | Runs batted in |
| Stat1value: | .215 |
| Stat2value: | 28 |
| Stat3value: | 12 |
| Teams: | |
Aloysius C. Joy (June 11, 1860 – June 28, 1937) was a Major League Baseball first baseman who played for the Washington Nationals of the Union Association in 1884.