| Bill Tierney | |
| Position: | First baseman/Outfielder |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | 14 May 1858 |
| Birth Place: | Boston, Massachusetts |
| Death Place: | Boston, Massachusetts |
| Debutleague: | MLB |
| Debutdate: | May 2 |
| Debutteam: | Cincinnati Red Stockings |
| Finalleague: | MLB |
| Finaldate: | April 24 |
| Finalteam: | Baltimore Monumentals |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .125 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Hits |
| Stat3value: | 1 |
| Teams: | |
William J. Tierney (May 14, 1858 – September 21, 1898) was a Major League Baseball player. He played for the 1882 Cincinnati Red Stockings of the American Association and the 1884 Baltimore Monumentals of the Union Association.