John K. O'Brien (born John K. Byrne, June 12, 1860 – November 20, 1910) was an American Major League Baseball player. He played primarily catcher and first base from 1882 to 1890 in the American Association.

Jack O'Brien
1888 baseball card of O'Brien
Catcher / First baseman
Born: (1860-06-12)June 12, 1860 Philadelphia
Died: November 20, 1910(1910-11-20) (aged 50) Philadelphia
Batted: Right Threw: Right
MLB debut
May 2, 1882, for the Philadelphia Athletics
Last MLB appearance
September 16, 1890, for the Philadelphia Athletics
MLB statistics
Batting average	.266
Home runs	11
Runs batted in	308
Teams
Philadelphia Athletics (1882–1886) Brooklyn Grays (1887) Baltimore Orioles (1888) Philadelphia Athletics (1890)

External links

• Career statistics and player information from Baseball Reference, or Baseball Reference (Minors)
• Baseball Almanac

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