Ano Liosia (Greek: Άνω Λιόσια) is a town and a former municipality in the northern part of the Athens agglomeration, Greece.

[3] Ano Liosia lies in the eastern part of West Attica, between the mountains Parnitha to its north and Aigaleo to its southwest.

The Ano Liosia railway station is served by Proastiakos trains to the Athens International Airport and to Kiato in the Peloponnese.

Ano Liosia is considered one of the most dangerous ghettos of Greece and along with its neighbouring cities Acharnes and Zefyri hold the highest crime rates of the whole country.

[4][5] Many drug addicts from various districts of Attica arrive to Ano Liosia as it is a convenient region to find their dose owing to the many dealers and the low to absent police patrols.