| Bill Farmer | |
| Birth Date: | 27 February 1864 |
| Birth Place: | Philadelphia |
| Death Date: | (aged 63) |
| Death Place: | Philadelphia |
| Bats: | Right |
| Throws: | Right |
| Debutleague: | MLB |
| Debutdate: | May 1 |
| Debutteam: | Pittsburgh Alleghenys |
| Finalleague: | MLB |
| Finaldate: | August 24 |
| Finalteam: | Philadelphia Athletics |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat2label: | Hits |
| Stat3label: | Runs |
| Stat1value: | .125 |
| Stat2value: | 2 |
| Stat3value: | 0 |
| Stat4label: | Home Runs |
| Stat4value: | 0 |
| Teams: | As Player
|
William Charles Farmer (February 27, 1864 – February 9, 1928) was a professional baseball player who played catcher in the major leagues in 1888 Pittsburgh Alleghenys of the National League and the Philadelphia Athletics of the American Association. He later played for the St. Paul Apostles of the Western Association in 1889 and 1890.