| Country: | GRC |
| Type: | EO |
| Route: | 33 |
| Direction A: | North |
| Direction B: | South |
| Terminus B: | Vlacherna |
| Regions: | West Greece, Peloponnese |
| Cities: | Patras |
Greek National Road 33 (Greek, Modern (1453-);: Εθνική Οδός 33, abbreviated as EO33) is a single carriageway road in southern Greece. It connects Patras with the Greek National Road 74 (Pyrgos - Tripoli) near Levidi, passing through the western and southern foothills of Mount Erymanthos.
The Greek National Road 33 passes through the following places: