Thomas J. O'Brien (February 20, 1873 – February 3, 1901) was an American professional baseball outfielder and first baseman. He played in Major League Baseball (MLB) from through for the Baltimore Orioles, Pittsburgh Pirates, and New York Giants.

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Not who you're looking for? Others named Tom O'Brien: American actor (born 1965) · British politician (1900-1970) · Major League Baseball player (1860–1921) · Irish jockey