Pefki (Greek: Πεύκη meaning "pine", before 1959: Μαγκουφάνα - Magkoufana) is 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.
Pefki is situated 10 km northeast of Athens city centre. The built-up area of Pefki is continuous with those of the neighbouring suburbs Irakleio, Lykovrysi, Kifisia and Marousi. Pefki consists of two neighbourhoods: Ano Pefki and Kato Pefki. Pefki is served by Athens Metro Line 1 and by several bus routes. The nearest motorway is Motorway 6, south of Pefki.