Walter Kingsley Irwin
- Bats Right, Throws Right
- Height 5' 10½", Weight 170 lb.
- Debut April 24, 1921
- Final Game May 12, 1921
- Born September 23, 1897 in Henrietta, PA USA
- Died August 18, 1976 in Spring Lake, MI USA
Walt Irwin was a World War I Veteran (BN). He had a cup of coffee as a pinch hitter and pinch runner for the St. Louis Cardinals in 1921. He was a millwright for Anderson Bolling, retiring in 1976. He died at age 78 and is buried in Altoona, PA.