1. Greece: This is the most obvious one! Greek is the official language of Greece and spoken by the majority of the population.
2. Cyprus: Greek is one of the two official languages of Cyprus, alongside Turkish.
3. Albania: A significant minority of Albanians, particularly in the southern region, speak Greek. While not an official language, Greek has regional recognition.
4. Italy: In the southern region of Italy, particularly in the regions of Sicily and Calabria, a significant number of people speak a dialect of Greek known as "Griko."
5. Turkey: While Turkish is the official language, there are Greek-speaking minorities in the western parts of Turkey.
Important Note: While Greek is spoken in these countries, the specific dialect and the level of fluency can vary greatly.