Frederick S. Treacey (c. 1847, Brooklyn[1] – After 1876) was an American professional baseball player who played outfield in the National Association and National League from 1871 to 1876.

Treacey played for the Chicago White Stockings, Athletic of Philadelphia, Philadelphia White Stockings, Philadelphia Centennials, and the New York Mutuals.

His brother, Pete Treacey, was his teammate on the Mutuals in 1876.

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