John Tomlinson Brush (June 15, 1845 – November 26, 1912) was an American sports executive who is primarily remembered as the owner of the New York Giants Major League Baseball franchise from 1890 until his death.
He also owned the Indianapolis Hoosiers in the late 1880s, and the Cincinnati Reds from 1891 to 1902.
Under his leadership, the Giants were revived as a franchise after a decline during the 1890s.
Brush was also a leader in the formation of the rules that govern the modern World Series.
He was one of 11 executives honored by the Baseball Hall of Fame on a Roll of Honor in 1946.