| Leon Carlson | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | February 17, 1895 |
| Birth Place: | Jamestown, New York |
| Death Place: | Jamestown, New York |
| Debutleague: | MLB |
| Debutdate: | May 31 |
| Debutteam: | Washington Senators |
| Finalleague: | MLB |
| Finaldate: | June 15 |
| Finalteam: | Washington Senators |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0–0 |
| Stat2label: | Strikeouts |
| Stat2value: | 3 |
| Stat3label: | Earned run average |
| Stat3value: | 3.65 |
| Teams: |
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Leon Alton Carlson (February 17, 1895 – September 15, 1961), nicknamed "Swede", was a professional baseball pitcher. He pitched in three games in Major League Baseball for the Washington Senators in 1920, all in relief.