Driving in Greece with a Guam Driving Licence: IDP Requirements and Rules
A visitor with a valid Guam driving licence can drive in Greece under the 1949 Geneva Convention route, because the United States applied that Convention to its territories and Greece recognizes convention-based foreign licences for drivers without normal residence in Greece. The current Greek rule does not separately require an International Driving Permit (IDP) for that route. There is no verified fixed visitor-day limit. Rental companies may still require an IDP.
Quick answer
For a short visit, the original valid Guam licence is the core legal document, provided it covers the vehicle and the driver meets the Greek minimum age for that category. An IDP is not a separate Greek legal requirement on the researched treaty route, but it is useful because some rental companies publish stricter documentation rules.
Legal treatment of a Guam licence in Greece
Guam is a U.S. territory. The United Nations Treaty Collection records a United States territorial application of the 1949 Geneva Convention on Road Traffic to United States Territories. Greece is a party to that Convention. Article 24 of the Convention covers valid driving permits issued by the competent authority of another contracting state or a subdivision of it. Greek Law 5209/2025 article 98 recognizes holders of valid driving licences under ratified international conventions when they do not have normal residence in Greece.
This convention route is the strongest pair-specific basis for a Guam licence. Greece also has a separate domestic rule for licences issued by the United States, but the text does not separately name Guam, so this page does not rely on that clause to create a Guam-specific exemption.
IDP requirement, recommendation and model
The researched Greek legal provisions do not make an IDP a separate condition for a non-resident driver whose Guam licence is recognized through the 1949 Convention. Greece also separately recognizes valid IDPs held by drivers without normal residence in Greece.
If an IDP is obtained for a Guam licence, the relevant model is the 1949 Geneva Convention IDP. AAA states that holders of licences from U.S. territories such as Guam can obtain an IDP through the United States, and its application accepts valid U.S.A. or territorial licences. No Greece-specific government recommendation for Guam licence holders was located, but AAA recommends an IDP for overseas travel and some Greek rental firms require one.
Visitor and resident rules
No authoritative fixed visitor maximum in days was verified for this pair. The treaty-based Greek rule instead depends on the driver not having normal residence in Greece, rather than a stated number of visitor days.
Once the driver establishes normal residence in Greece, the visitor convention route no longer supplies the same recognition basis. Greece has an official procedure for converting certain licences issued by the USA to Greek licences for residents, but the published service does not expressly identify Guam or U.S. territorial licences. Guam-specific conversion eligibility is therefore unverified – confirm with official authority.
Rental-car requirements
Rental policy can be stricter than the legal driving rule. Avis Greece says the renter must hold a licence issued by an EU country or an International Driving Permit, and the IDP must be accompanied by the national licence. Sixt Greece says a licence from outside the European Union must be complemented by an international licence.
Autohellas Hertz publishes a more specific country table. It lists USA, Canada and Australia among places for which the national licence is accepted, while other countries generally require the national and international licence. Guam is not separately named, so it is prudent to confirm how the booked Hertz location classifies a Guam territorial licence.
Police documents and insurance
Greek Law 5209/2025 article 103 requires the driver to carry the lawful driving licence, vehicle registration, proof of insurance, circulation-tax proof and any additional category-specific documents. For a vehicle rented from a car-rental or leasing company, the law provides a specific exception: the vehicle carries only a copy of the registration and does not have to carry the insurance proof or circulation-tax receipt.
No Guam-specific insurance restriction was verified. Autohellas Hertz states that authorized drivers are covered for third-party liability and fire subject to its insurer terms. That is a rental-company contractual condition, not a rule that determines whether the Guam licence is legally recognized.
Relevant exceptions
The licence must be valid and cover the vehicle being driven. The driver must also meet the minimum age required in Greece for the corresponding category. The legal basis described here is for a person who does not have normal residence in Greece. If residence changes, the visitor rule should not be assumed to continue.
A rental company can demand an IDP even where Greek law does not make one a separate legal condition. That distinction is especially important for this pair because published rental terms are not uniform.
Official sources used
- U.S. Department of the Interior, Guam political status, verifying that Guam is a U.S. territory, https://www.doi.gov/node/11564, checked 2026-09-27.
- United Nations Treaty Collection, 1949 Convention on Road Traffic and United States territorial application to United States Territories, territorial application record, checked 2026-09-27.
- Greek Law 5209/2025, current consolidated article 98 on recognized foreign driving licences, current legal text, checked 2026-09-27.
- Greek Law 5209/2025, current article 103 on documents carried by drivers, current legal text, checked 2026-09-27.
- Greek National Registry of Administrative Public Services and gov.gr, USA licence conversion procedure for residents, gov.gr service, checked 2026-09-27.
- AAA, U.S. Department of State-authorized IDP issuer, including guidance for Guam territorial licence holders, AAA IDP guidance, checked 2026-09-27.
- Autohellas Hertz Greece, accepted driving licences by country and general rental terms, Hertz Greece licence table, checked 2026-09-27.
- Sixt Greece, country-specific rental information, Sixt Greece rental information, checked 2026-09-27.
- Avis Greece, published pickup and licence requirements, Avis Greece requirements page, checked 2026-09-27.
Practical recommendation
Travel with the original valid Guam licence. For a normal visitor, the researched legal basis does not make a separate IDP mandatory, but a 1949 Geneva Convention IDP from AAA is sensible if renting because AAA specifically supports Guam territorial licence holders and some Greek rental companies require an IDP for non-EU licences. Confirm the rental desk documentation rules before pickup.
Last verified date
This Guam to Greece driving-licence information was checked against the listed legal, treaty, government, issuer and rental-company sources on 2026-09-27.