| Orville Armbrust | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | March 2, 1910 |
| Birth Place: | Beirne, Arkansas |
| Death Place: | Mobile, Alabama |
| Debutleague: | MLB |
| Debutdate: | September 18 |
| Debutyear: | 1934 |
| Debutteam: | Washington Senators |
| Finalleague: | MLB |
| Finaldate: | September 30 |
| Finalyear: | 1934 |
| Finalteam: | Washington Senators |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 1–0 |
| Stat2label: | Strikeouts |
| Stat2value: | 3 |
| Stat3label: | Earned run average |
| Stat3value: | 2.13 |
| Teams: | |
Orville Martin Armbrust (March 2, 1908 – October 2, 1967) was a professional baseball pitcher. He appeared in three games in Major League Baseball, two of them starts, in 1934 for the Washington Senators.