Agios Athanasios (Greek: Άγιος Αθανάσιος) is a town and a former municipality in the Thessaloniki regional unit, Macedonia, Greece.

Agios Athanasios is the biggest Greek refugee town in the Thessaloniki regional unit.

It is built on the old national road that linked, in the past, Thessaloniki to the Western Macedonia and to the Southern Greece.

Around 1850, the tenant farmers built the small church of Saint George, which is the oldest building of the town.

The first refugees were settled in the few poorly built houses, in the storing places and the stables of the chiflik Kavakli.