**As of November 2021 Americans, Canadians, and Australians do not need an International Driver’s Permit.
International driver license: The quick answer is if you live outside of the EU, you might an international driving permit. We recommend searching online for your particular country to double check before traveling.
If the police stop you in Santorini without an international driving permit you are going to pay an expensive ticket. Also, the store that rented to you will pay also a ticket. So, bottom line is, EU countries can rent without an IDP but non-EU citizens should research before traveling.
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Hope this helped!
-Katia