Yes, you can use a Eurail Pass on ferries in Greece, but it is typically managed through the specialized Eurail Greek Islands Pass. This pass is designed specifically for ferry travel and usually offers either 4 or 6 ferry trips within one month. The 6-day version often includes international crossings between Italy (Venice, Ancona, or Bari) and Greece (Patras or Igoumenitsa) operated by the Attica Group (Superfast Ferries and Blue Star Ferries). For domestic travel, the pass covers over 50 Greek islands, including popular destinations like Santorini, Mykonos, Crete, and Rhodes. If you hold a standard Eurail Global Pass, you may also be entitled to discounts (often 30%) on various ferry lines, or sometimes a fully "free" deck-passage crossing between Italy and Greece, though you must still pay port taxes and seasonal surcharges. In 2026, it is highly recommended to use the Eurail Rail Planner app to reserve your ferry spots in advance, as ferry capacity is strictly limited, especially during the peak summer months from June to September.