| Bill Warren | |
| Position: | Catcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | February 11, 1884 |
| Birth Place: | Missouri |
| Death Place: | Whiteville, Tennessee |
| Debutleague: | MLB |
| Debutdate: | April 30 |
| Debutteam: | Indianapolis Hoosiers |
| Finalleague: | MLB |
| Finaldate: | May 23 |
| Finalteam: | Newark Pepper |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .245 |
| Stat2label: | Hits |
| Stat2value: | 13 |
| Stat3label: | Runs batted in |
| Stat3value: | 6 |
| Teams: | |
William Hackney Warren (February 11, 1884 – January 28, 1960), nicknamed "Hack", was a Major League Baseball player. Warren played for the Indianapolis Hoosiers/Newark Pepper of the Federal League in and . He batted and threw right-handed.
He was born in Missouri and died at his home in Whiteville, Tennessee.