Most travellers to Greece won’t require a visa due to the Schengen Agreement that allows for 90 days of travel in the European Union (EU) without a visa for nationals of certain countries.  For more information on whether you are required to obtain a Visa before entering Greece, please visit below links:

https://www.intrepidtravel.com/en/greece/do-you-need-a-visa-for-greece

https://www.mfa.gr/en/visas/visas-for-foreigners-traveling-to-greece/countries-requiring-or-not-requiring-visa.html