John Emmett Seery (February 13, 1861 – August 7, 1930) was an outfielder in Major League Baseball.

He played for the Baltimore Monumentals, Kansas City Cowboys, St. Louis Maroons, Indianapolis Hoosiers, Brooklyn Ward's Wonders, Cincinnati Kelly's Killers, and Louisville Colonels from 1884 to 1892.

He was then purchased by the Indianapolis Hoosiers in March 1887 and played the next three years there as the club's regular left fielder.

It was arguably Seery's best campaign, and he finished in the National League's top 10 in on-base percentage (.401), hits (165), and runs scored (123).

[1] The following year, Seery joined the Brooklyn Ward's Wonders of the Players' League, and his batting average fell to .223.

[1] Seery also had short stints that year in the Southern Association and the Western League.

[1] After retiring from baseball Seery lived in Florida, "thriving" as the proprietor of an orange grove.