| Grey South | |
| Province: | Ontario |
| Prov-Status: | defunct |
| Prov-Created: | 1867 |
| Prov-Abolished: | 1996 |
| Prov-Election-First: | 1867 |
| Prov-Election-Last: | 1995 |
Grey South was an electoral riding in Ontario, Canada. It was created in 1867 at the time of confederation and was abolished in 1996 before the 1999 election.
The riding was known as Grey from 1974 to 1987, and Grey—Owen Sound from 1987 to 1999.