Elmer E. Johnston (November 22, 1898 – November 26, 1985) was an American politician in the state of Washington. He served in the Washington House of Representatives from 1947 to 1966 for District 6.
Elmer E. Johnston was born on November 22, 1898, in Oakesdale, Washington. His parents were John Herbert Johnston and Minnie Gertrude Johnston ().
Johnston studied at the University of Idaho and the University of Notre Dame, then received his law degree from Georgetown University Law Center. He served in the U.S. Army during World War I.
Johnston began his law career in 1925 in Idaho's Wallace and Kellogg cities. He served one year as a Shoshone County prosecutor from 1931.
In 1935, Johnston established his own practice in Spokane's Peyton Building. He was the Republican candidate for the city's prosecuting attorney in 1942.
At one point, Johnston served as professor of mining law at Gonzaga University.
Johnston was married and had at least three children. He died in Everett's Providence Hospital on November 26, 1985.