| Dufferin–Simcoe | |
| Province: | Ontario |
| Prov-Status: | defunct |
| Prov-Created: | 1933 |
| Prov-Abolished: | 1986 |
| Prov-Election-First: | 1934 |
| Prov-Election-Last: | 1985 |
Dufferin–Simcoe was an electoral riding in Ontario, Canada. It was created in 1934 during a major redistribution of Ontario ridings. It was abolished in 1986 before the 1987 election and merged into Simcoe West.