Pefki (, , meaning "pine", before 1959: ÃÂñóúÿàÃÂìýñ Magkoufana ) is a town and a suburb in the northeastern part of the Athens agglomeration, Greece. Since the 2011 local government reform, it is part of the municipality Lykovrysi-Pefki, of which it is the seat and a municipal unit and is part of North Athens regional unit. According to the 2021 population census, Pefki has 21,293 residents.
Pefki is situated northeast of Athens city centre. The municipal unit has an area of 2.176 km<sup>2</sup>. The built-up area of Pefki is continuous with those of the neighbouring suburbs Irakleio, Lykovrysi, Kifisia and Marousi. Pefki consists of two areas: Ano Pefki and Kato Pefki. Pefki is served by Athens Metro Line 1, with the relevant station called "KAT", named after the KAT Hospital that is nearby, and by several bus routes. The nearest motorway is the A6, south of Pefki.
The Japanese Community School of Athens was previously located in Ano Pefki.
Pefki is twinned with: