| Pete Loos | |
| Position: | Pitcher |
| Birth Date: | March 23, 1878 |
| Birth Place: | Philadelphia |
| Death Place: | Darby, Pennsylvania |
| Bats: | Unknown |
| Throws: | Right |
| Debutleague: | MLB |
| Debutdate: | May 2 |
| Debutyear: | 1901 |
| Debutteam: | Philadelphia Athletics |
| Finalleague: | MLB |
| Finaldate: | May 2 |
| Finalyear: | 1901 |
| Finalteam: | Philadelphia Athletics |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0–1 |
| Stat2label: | Earned run average |
| Stat2value: | 27.00 |
| Teams: |
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Ivan Loos (March 23, 1878 – February 23, 1956) was a 5'6 American Major League Baseball pitcher, who had a right hand throw. He played for the Philadelphia Athletics during the season.