| Bill Daley | |
| Width: | 250px |
| Position: | Pitcher |
| Bats: | Unknown |
| Throws: | Left |
| Birth Date: | 27 June 1868 |
| Birth Place: | Poughkeepsie, New York, U.S. |
| Death Place: | Poughkeepsie, New York, U.S. |
| Debutleague: | MLB |
| Debutdate: | July 17 |
| Debutyear: | 1889 |
| Debutteam: | Boston Beaneaters |
| Finalleague: | MLB |
| Finaldate: | June 30 |
| Finalyear: | 1891 |
| Finalteam: | Boston Reds |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 29–16 |
| Stat2label: | Earned run average |
| Stat2value: | 3.37 |
| Stat3label: | Strikeouts |
| Stat3value: | 223 |
| Teams: | |
William Daley (June 27, 1868 – May 4, 1922) was an American Major League Baseball pitcher from 1889 to 1891. He played for the Boston Beaneaters and Boston Reds.
Daley started his professional baseball career with the Jersey City Skeeters in 1887. In 1890 – his only full season in the majors – he led the Players' League in winning percentage with a record of 18–7.