John A. Greason
- Bats Unknown, Throws Left
- Debut August 27, 1873
- Final Game September 6, 1873
- Born July 29, 1851 in Washington, DC USA
- Died July 22, 1889 in Washington, DC USA
John Greason, who was born and died in Washington, D.C., was one of two pitchers on the Washington Blue Legs in 1873, with the other being Bill Stearns. Although the team went only 8-31, it featured the 18-year-old Paul Hines as its best-hitting regular.
John is one of two major leaguers (through 2007) named Greason, with the other being Bill Greason.