| Elmer Roy Smith | |
| Office1: | Ontario MPP |
| Term Start1: | 1943 |
| Term End1: | 1945 |
| Predecessor1: | Milton Taylor Armstrong |
| Successor1: | Milton Taylor Armstrong |
| Constituency1: | Parry Sound |
| Party: | CCF |
| Birth Date: | 24 December 1912 |
| Birth Place: | Parry Sound, Ontario |
| Death Place: | Parry Sound, Ontario |
| Occupation: | Carpenter |
Elmer Roy Smith (December 24, 1913[1] - September 14, 1989) was a carpenter[1] 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.[1]