Dad Clarke should not be confused with Dad Clark.
| Dad Clarke | |
| Position: | Pitcher |
| Bats: | Both |
| Throws: | Right |
| Birth Date: | January 7, 1865 |
| Birth Place: | Oswego, New York, U.S. |
| Death Place: | Lorain, Ohio, U.S. |
| Debutleague: | MLB |
| Debutdate: | April 23 |
| Debutyear: | 1888 |
| Debutteam: | Chicago White Stockings |
| Finalleague: | MLB |
| Finaldate: | October 15 |
| Finalyear: | 1898 |
| Finalteam: | Louisville Colonels |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 44–51 |
| Stat2label: | Earned run average |
| Stat2value: | 4.16 |
| Stat3label: | Strikeouts |
| Stat3value: | 175 |
| Teams: |
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William H. "Dad" Clarke (January 7, 1865 – June 3, 1911) was an American professional baseball pitcher. He played in Major League Baseball from to for the Chicago White Stockings, Columbus Solons, New York Giants, and Louisville Colonels.