| Bill Kalfass | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Left |
| Birth Date: | 3 March 1916 |
| Birth Place: | New York City |
| Death Place: | Brooklyn, New York |
| Debutleague: | MLB |
| Debutdate: | September 15 |
| Debutteam: | Philadelphia Athletics |
| Finalleague: | MLB |
| Finaldate: | October 2 |
| Finalteam: | Philadelphia Athletics |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 1-0 |
| Stat2label: | Earned run average |
| Stat2value: | 3.00 |
| Stat3label: | Strikeouts |
| Stat3value: | 9 |
| Teams: | |
William Philip Kalfass (March 3, 1916 – September 8, 1968) was a Major League Baseball pitcher who played in with the Philadelphia Athletics. He batted right and threw left-handed.