Kyriaki (Greek: Κυριακή) is a village in the central part of the Evros regional unit in Greece, in the municipal unit of Orfeas of the municipality Soufli.

Kyriaki is in a valley in the wooded Eastern Rhodope Mountains, 15 km southeast of the Bulgarian-Greek border.

The village was founded by the Ottoman Turks in the 14th century, it was known as Kayadjik(Turkish: Kayajik).

According to professor Lyubomir Miletich, the 1912 population had around 200 Bulgarian families.

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