Agathonisi (Greek: Αγαθονήσι) (Gaidaro) is a Greek island in the Aegean Sea.
There are three towns on the island of Agathonisi: the port town of Agios Georgios and two smaller towns named Megálo Chorió and Mikró Chorió.
A thrice-weekly ferry from Pythagoreio on Samos takes slightly longer than one hour and is the only method of arrival to Agathonisi.
2nd-order administrative division
Primary administrative division