| William Sullivan | |
| Position: | Pitcher and Outfielder |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | 12 March 1864 |
| Birth Place: | St. Louis |
| Death Place: | St. Louis |
| Debutleague: | MLB |
| Debutdate: | May 29 |
| Debutyear: | 1884 |
| Debutteam: | St. Louis Maroons |
| Finalleague: | MLB |
| Finaldate: | May 29 |
| Finalyear: | 1884 |
| Finalteam: | St. Louis Maroons |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 1–0 |
| Stat2label: | Strikeouts |
| Stat2value: | 3 |
| Stat3label: | Earned run average |
| Stat3value: | 4.50 |
| Teams: |
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William F. Sullivan (March 12, 1864 – September 27, 1911) was a professional baseball player. He appeared in one game in Major League Baseball for the St. Louis Maroons of the Union Association in 1884.