Avlonas (Greek: Αυλώνας,[2] before 1927: Σάλεσι - Salesi[3]) is a town and a former municipality in Attica, Greece.

Avlonas has a Mediterranean climate (Köppen: Csa) with strong continentality.

The town experiences hot summers, cool winters and a wet climate by Attica's standards.

[7][8] In August 2024 a new station from the National Observatory of Athens started operating in Avlonas.

It appears that the name Αvlon is connected with the worship of Dionysus according to an ancient slab that was found in the area, dedicated to Διονύσῳ Αὐλωνεῖ (Dionysos of Avlon).