Agios Kirykos is a town and a former municipality on the island of Ikaria, North Aegean, Greece. Since the 2011 local government reform it is part of the municipality Ikaria, of which it is a municipal unit. Its population was 3,565 at the 2021 census, and its land area is 74.7 square kilometres. It is the administrative capital of Ikaria and the Ikaria regional unit.