Yes, Santorini is located in Greece, in Europe, in the Aegean Sea.
To be precise, it is located in the devolved administration of the Aegean Islands, in the region of the Southern Aegean Islands, in the regional unit of Thira, in the municipality of Thira.
Formally, Santorini has been part of Greece since 1930 (under the London Protocol of 3 February 1930).
Greece is a country in south-eastern Europe. It is a member of the European Union, NATO and the Eurozone. Greece has an area of 13,940 km² and a population of around 10 million people. The capital city of Greece is Athens.