Avlonas (, before 1927: ãìûõÃÂù - Salesi) is a town and a former municipality in Attica, Greece. Since the 2011 local government reform it is part of the municipality Oropos, of which it is a municipal unit. The municipal unit has an area of 106.092 km<sup>2</sup>.
Avlonas is situated in the northwestern part of East Attica, at the northern edge of the Parnitha mountain range and 10 km south of the South Euboean Gulf coast. It is 30 km north of Athens city center. The A1 motorway (Athens - Thessaloniki) passes north of the town. Avlonas has a station on the railway from Athens to Thessaloniki. The municipal unit Avlonas also includes the village Asprochori (pop. 151). Avlonas has three pre-school facilities, one elementary school, one lyceum/middle school and one gymnasio/high school.
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. The highest temperature was 46.2 ðC and was recorded on July 26, 2023, and the lowest, âÂÂ9.8 ðC, was recorded on January 9, 2019. In August 2024 a new station from the National Observatory of Athens started operating in Avlonas while the old station was moved to another location in March 2025.
Avlonas (Greek: ÃÂàûÃÂýñÃÂ) is sometimes called Avlona (ÃÂàûÃÂýñ), however the masculine Avlonas is the correct form rather than the feminine Avlona. The ancient Greek Avlon (ÃÂàûÃÂý) is also masculine. It appears that the name ÃÂvlon is connected with the worship of Dionysus according to an ancient slab that was found in the area, dedicated to ÃÂùÿýÃÂÃÂῳ ÃÂá½ÂûÃÂýõῠ(Dionysos of Avlon).
Avlonas has historically been an Arvanite settlement.