| Alonzo Breitenstein | |
| Position: | Pitcher |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | 9 November 1857 |
| Birth Place: | Utica, New York |
| Death Place: | Utica, New York |
| Debutleague: | MLB |
| Debutdate: | July 7 |
| Debutyear: | 1883 |
| Debutteam: | Philadelphia Quakers |
| Finalleague: | MLB |
| Finaldate: | July 7 |
| Finalyear: | 1883 |
| Finalteam: | Philadelphia Quakers |
| Stat3label: | Strikeouts |
| Stat3value: | 0 |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0–1 |
| Stat2label: | Earned run average |
| Stat2value: | 9.00 |
| Teams: | |
Alonzo Breitenstein (November 9, 1857 – June 19, 1932) was a National League pitcher. Breitenstein played for the Philadelphia Quakers in the season. In one career game, he had a 0–1 record with a 9.00 ERA. Breitenstein allowed nine runs on eight hits, in five innings pitched. He was removed from the game at relieved by Art Hagan after being hit by a pitch while batting.[1] With what hand he batted and threw is unknown.
Alonzo Breitenstein was born on November 9, 1857, in Utica, New York. He died on June 19, 1932, in Utica. He was buried at Forest Hill Cemetery in Utica.[2]