Greek National Road 33 (Greek: 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:

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