John A. Greason (July 29, 1851 – July 22, 1889) was an American professional baseball player from Washington, D.C. who pitched a total of seven games for the 1873 Washington Blue Legs of the National Association of Professional Base Ball Players.

[1] In his short one-season career, he started and completed all seven of his games, had a 1–6 win–loss record and a 5.86 ERA.

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