| William A. Gardner | |
| Position: | Pitcher |
| Birth Date: | 6 September 1866 |
| Birth Place: | Baltimore, Maryland, United States |
| Death Place: | Cantonsville, Maryland |
| Bats: | Unknown |
| Throws: | Unknown |
| Debutleague: | MLB |
| Debutdate: | August 9 |
| Debutyear: | 1887 |
| Debutteam: | Baltimore Orioles |
| Finalleague: | MLB |
| Finaldate: | September 6 |
| Finalyear: | 1887 |
| Finalteam: | Baltimore Orioles |
| Statleague: | MLB |
| Stat1label: | Pitching record |
| Stat1value: | 0-1 |
| Stat2label: | Strikeouts |
| Stat2value: | 3 |
| Stat3label: | ERA |
| Stat3value: | 11.08 |
William A. Gardner (September 6, 1868 - Unknown) was an American professional baseball player who played three games for the Baltimore Orioles of the American Association in .He was born in Baltimore, Maryland.