| Lou Knerr | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 21 August 1921 |
| Birth Place: | Denver, Pennsylvania, U.S. |
| Death Place: | Reading, Pennsylvania, U.S. |
| Debutleague: | MLB |
| Debutdate: | April 17 |
| Debutyear: | 1945 |
| Debutteam: | Philadelphia Athletics |
| Finalleague: | MLB |
| Finaldate: | June 7 |
| Finalyear: | 1947 |
| Finalteam: | Washington Senators |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 8–27 |
| Stat2label: | Earned run average |
| Stat2value: | 5.04 |
| Stat3label: | Strikeouts |
| Stat3value: | 104 |
| Teams: | |
Wallace Luther Knerr (August 21, 1921 – March 23, 1980) was a Major League Baseball player who played pitcher from 1945 to 1947. He played for the Philadelphia Athletics and Washington Senators.