Wheeler Roger Johnston
- Bats Left, Throws Left
- Height 6' 0", Weight 170 lb.
- Debut October 3, 1909
- Final Game September 30, 1922
- Born September 9, 1887 in Cleveland, TN USA
- Died February 17, 1961 in Chattanooga, TN USA
Doc Johnston spent most of his 11-year major league career with the Cleveland Indians, for whom he played from 1912 to 1914, when they were still called the "Cleveland Naps" and from 1918 to 1921. He was part of the Indians' first World Series-winning team, in 1920, as the starting first baseman. He was the brother of Jimmy Johnston.
He was the first baseman with the Pittsburgh Pirates in 1915 and 1916 but in 1917 (after Johnston had hit .213 in 1916) the Pirates moved the elderly Honus Wagner to first base. Johnston spent the year with the Birmingham Barons in the Southern Association and hit .374 for the New Orleans Pelicans during a month in 1918 before joining the Milwaukee Brewers of the American Association and resurfacing with the Indians in June of that year.