Agios Georgios (Greek: Άγιος Γεώργιος) or San Tzortzis is a Greek uninhabited island in the entry of Saronic Gulf.

[2] In antiquity the island was named Belbina (Ancient Greek: Βέλβινα) and is mentioned by Herodotus in a dialogue between Themistocles and his political opponent Timodemos from Afidnes.

Though some scholars have proposed that Agios Georgios should be identified as the ancient Psyttaleia which was involved in the Battle of Salamis, the consensus remains with the island that has long been known as Lipsokoutali, now renamed Psyttaleia.

[4] In 2016 a 73 MW wind farm was built on the island by Terna Energy.

In recent years, the municipality of Lavreotiki challenged the ownership of the island (and its associated wind farm revenues), however a 2017 legal judgement reaffirmed Hydra's ownership.