| George Graham Johnston | |
| Office: | Ontario MPP |
| Term Start: | 1943 |
| Term End: | 1960 |
| Predecessor: | Duncan McArthur |
| Successor: | Art Evans |
| Constituency: | Simcoe Centre |
| Party: | Progressive Conservative |
| Birth Date: | 15 April 1882 |
| Birth Place: | Minesing, Ontario |
| Death Place: | Barrie, Ontario |
| Spouse: | Alice Mary Young |
| Occupation: | Manufacturer |
George Graham Johnston (April 15, 1882 – May 29, 1960) was a politician in Ontario, Canada. He was a Progressive Conservative member of the Legislative Assembly of Ontario from 1943 to 1960 who represented the riding of Simcoe Centre.
Johnston was born in Minesing, Ontario, he was a manufacturer.[1] Johnston died in office in 1960 from a heart attack.[2]
Johnston ran as the Progressive Conservative candidate in the 1943 Ontario general election. He defeated Liberal O.E. Todd by 584 votes.[3] He was re-elected five times before his death in 1960.