Nea Erythraia (Greek: Νέα Ερυθραία) is a town and a suburb in the northeastern part of the Athens agglomeration, Greece.

[2] Nea Erythraia is situated at the western end of the forested Penteli mountain range.

Nea Erythraia is situated 14 km northeast of Athens city centre.

The built-up area of Nea Erythraia is continuous with that of the neighbouring suburb Kifisia.

For many years, Nea Erythraia was home to the senior division of Campion, one of Greece's oldest English-language schools.