Aisymi (Greek: Αισύμη, Bulgarian: Дуган Хисар, Dugan hisar, Turkish: Doğanhisar) is a village in the southern part of the Evros regional unit, Greece.

It is located next to the Greek National Road 53, about 20 km north of the city of Alexandroupoli.

[citation needed] Like the rest of Western Thrace, it was ruled by the Ottoman Empire since the 14th century.

At that time, Aisymi (then known as Doğanhisar, Dugan Hisar in Bulgarian) was a Bulgarian speaking village like many parts of today's Evros prefecture.

As a result its Bulgarian and Turkish population was exchanged with Greek refugees, mainly from today's Turkey.