William J. Madigan
- Bats Unknown, Throws Right
- Weight 126 lb.
- Debut July 10, 1886
- Final Game September 4, 1886
- Born July 18, 1868 in Washington, DC USA
- Died December 4, 1954 in Washington, DC USA
Tony Madigan made his major league debut before he turned 18. In his one major league season, he went 1-13 for a team that went 28-92. He was the youngest player in the league.
The following year he played for Binghamton.