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. His first six teams ended their existence in a season in which he played for them. In 916 career Major League games, Seery batted .252 with 893 hits. He was 5 feet, 7 inches tall and weighed 145 pounds.