| Billy Hart | |
| Position: | Pitcher |
| Birth Date: | 16 May 1866 |
| Birth Place: | Palmyra, Missouri |
| Death Place: | Hannibal, Missouri |
| Bats: | Unknown |
| Throws: | Unknown |
| Debutleague: | MLB |
| Debutdate: | July 13 |
| Debutyear: | 1890 |
| Debutteam: | St. Louis Browns |
| Finalleague: | MLB |
| Finaldate: | October 14 |
| Finalyear: | 1890 |
| Finalteam: | St. Louis Browns |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 12-8 |
| Stat2label: | Earned run average |
| Stat2value: | 3.67 |
| Stat3label: | Strikeouts |
| Stat3value: | 95 |
| Teams: |
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Robert Lee Hart (1866–1944), was a professional baseball player who played pitcher in the Major Leagues for the 1890 St.Louis Browns of the American Association. He played in the minors from 1886–1892.