| Walt Irwin | |
| Position: | Pinch hitter / Pinch runner |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 23 September 1897 |
| Birth Place: | Henrietta, Pennsylvania |
| Death Place: | Spring Lake, Michigan |
| Debutleague: | MLB |
| Debutdate: | April 24 |
| Debutyear: | 1921 |
| Debutteam: | St. Louis Cardinals |
| Finalleague: | MLB |
| Finaldate: | May 12 |
| Finalyear: | 1921 |
| Finalteam: | St. Louis Cardinals |
| Statleague: | MLB |
| Stat1label: | Games |
| Stat1value: | 4 |
| Stat2label: | At bats |
| Stat2value: | 1 |
| Stat3label: | Runs |
| Stat3value: | 1 |
| Teams: | |
Walter Kingsley Irwin (September 23, 1897 – August 18, 1976) was a Major League Baseball player. Irwin played for St. Louis Cardinals in as pinch runner and pinch hitter in 4 games.
Irvin was born in Henrietta, Pennsylvania, and died in Spring Lake, Michigan.