| Thomas Dalton Johnston | |
| Parliament: | Ontario Provincial |
| Term Start: | June 25, 1923 |
| Term End: | October 18, 1926 |
| Predecessor: | Ernest Nicholls McDonald |
| Successor: | William Alfred Anderson |
| Riding: | Peterborough East |
| Party: | Conservative |
Thomas Dalton Johnston was a Canadian politician from the Conservative Party of Ontario. He represented Peterborough East in the Legislative Assembly of Ontario from 1923 to 1926.[1]