John Joseph Warner (August 15, 1872 – December 21, 1943) was an American professional baseball catcher who played in Major League Baseball from 1895 through 1908.

He played for the Boston Beaneaters, Louisville Colonels, New York Giants, Boston Americans, St. Louis Cardinals, Detroit Tigers and Washington Senators.

In 1906, Warner was part of the first season-long platoon arrangement in baseball, sharing time at catcher with Fred Payne and Boss Schmidt.

[1] In 1,074 major league games, Warner had a .249 batting average and .303 on-base percentage.

This biographical article relating to a United States baseball catcher born in the 1870s is a stub.