| Matt Zeiser | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | September 25, 1888 |
| Birth Place: | Chicago, Illinois |
| Death Place: | Chicago, Illinois |
| Debutleague: | MLB |
| Debutdate: | April 27 |
| Debutteam: | Boston Red Sox |
| Finalleague: | MLB |
| Finaldate: | May 11 |
| Finalteam: | Boston Red Sox |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0-0 |
| Stat2label: | Strikeouts |
| Stat2value: | 0 |
| Stat3label: | Earned run average |
| Stat3value: | 1.80 |
| Teams: |
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Mathias John Zeiser (sometimes spelled Zieser) (September 25, 1888 – June 10, 1942) was a professional baseball pitcher. He appeared in two games in Major League Baseball for the Boston Red Sox during the 1914 season, both as a relief pitcher. Zeiser batted and threw right-handed. He was born and died in Chicago, Illinois.
In a two-game career, Zeiser posted a 1.80 earned run average with eight walks in 10 innings pitched.