| Willie Clark | |
| Position: | First baseman |
| Birth Date: | 16 August 1872 |
| Birth Place: | Pittsburgh, Pennsylvania, U.S. |
| Death Place: | Pittsburgh, Pennsylvania, U.S. |
| Bats: | Left |
| Throws: | Left |
| Debutleague: | MLB |
| Debutdate: | June 20 |
| Debutyear: | 1895 |
| Debutteam: | New York Giants |
| Finalleague: | MLB |
| Finaldate: | August 3 |
| Finalyear: | 1899 |
| Finalteam: | Pittsburgh Pirates |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .286 |
| Stat2label: | Home runs |
| Stat2value: | 2 |
| Stat3label: | Runs batted in |
| Stat3value: | 199 |
| Teams: |
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William Otis Clark (August 16, 1872 – November 13, 1932) was an American professional baseball first baseman for the New York Giants and Pittsburgh Pirates of Major League Baseball between 1895 and 1899.
In 350 games over five seasons, Clark posted a .286 batting average (366-for-1280) with 188 runs, 2 home runs and 199 RBI. He recorded a .983 fielding percentage as a first baseman.