| Bill Kelly | |
| Position: | Outfielder |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | Unknown |
| Birth Place: | New York, New York |
| Death Date: | Unknown |
| Debutleague: | MLB |
| Debutdate: | May 4 |
| Debutyear: | 1871 |
| Debutteam: | Fort Wayne Kekiongas |
| Finalleague: | MLB |
| Finaldate: | August 29 |
| Finalyear: | 1871 |
| Finalteam: | Fort Wayne Kekiongas |
| Statleague: | MLB |
| Stat1label: | At bats |
| Stat1value: | 67 |
| Stat2label: | Runs |
| Stat2value: | 16 |
| Stat3label: | Home runs |
| Stat3value: | 0 |
| Stat4label: | Batting average |
| Stat4value: | .224 |
| Teams: | |
William J. Kelly was an American professional baseball player. He played in 18 games for the Fort Wayne Kekiongas in the first professional league, the 1871 National Association of Professional Base Ball Players (NAPBBP).