| Bill Mack | |
| Position: | Pitcher |
| Bats: | Left |
| Throws: | Left |
| Birth Date: | 12 February 1885 |
| Birth Place: | Elmira, New York |
| Death Place: | Elmira, New York |
| Debutleague: | MLB |
| Debutdate: | July 14 |
| Debutteam: | Chicago Cubs |
| Finalleague: | MLB |
| Finaldate: | July 21 |
| Finalteam: | Chicago Cubs |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0-0 |
| Stat2label: | Earned run average |
| Stat2value: | 3.00 |
| Stat3label: | Strikeouts |
| Stat3value: | 2 |
| Teams: |
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William Francis Mack (February 12, 1885 – September 30, 1971) was a pitcher in Major League Baseball. He played for the Chicago Cubs in July 1908. He was the last surviving player to have played for the 1908 Chicago Cubs, their most recent World Series championship until 2016.