William Alexander O'Hara
- Bats Left, Throws Right
- Height 5' 10", Weight 165 lb.
- Debut April 15, 1909
- Final Game May 8, 1910
- Born August 14, 1881 in Toronto, ON CAN
- Died June 15, 1931 in Jersey City, NJ USA
Bill O'Hara was the centerfielder for the 1909 New York Giants who won 92 games.
There have been three major league players with the last name "O'Hara". All of them had their entire careers in the decade from 1901-1910.