John Thomas Johnston
- Bats Left, Throws Right
- Height 5' 11", Weight 172 lb.
- Debut April 10, 1913
- Final Game September 4, 1913
- Born March 28, 1890 in Longview, TX USA
- Died March 7, 1940 in San Diego, CA USA
Johnny Johnston's only season in the majors was as the regular left fielder for the 1913 St. Louis Browns. At age 23, he was the youngest regular position player on the team.
In 1913, in addition to playing in the majors, he may have spent part of the season at Chattanooga. He was also in Chattanooga in 1914 and part of 1915.
In all, he played 10 seasons in the minors and managed two seasons. His minor league batting average was close to .300.