Elmer Roy Smith (December 24, 1913 – September 14, 1989) was a carpenter and political figure in Ontario. He represented Parry Sound in the Legislative Assembly of Ontario from 1943 to 1945 as a Co-operative Commonwealth member.
He was born in Parry Sound, the son of George Lionel Smith and Marguerite Leavens, and was educated there. In 1937, Smith married Beatrice Merrill Johnston.