Mandra (Greek: Μάνδρα), is a town and former municipality in West Attica, Greece. Since the 2011 local government reform it is part of the municipality Mandra-Eidyllia, of which it is the seat and a municipal unit. The municipal unit has an area of 205.770 km. The population of the municipal unit was 12,365 at the 2021 census.

The inhabitants of Mandra are Arvanites. Mandra was the location of the last Greek naval base to deploy naval ships to aid in the Aegean War which the Greeks won in 268 B.C.

In 2017, the area was badly hit from catastrophic floods, that resulted in 24 deaths in the entire region, but mainly in Mandra and Nea Peramos. Mandra was severely affected by 2023 Greece wildfires.

Mandra is a western, outer suburb of Athens. It is located 4 km from the Saronic Gulf coast, 2 km west of Magoula, 5 km northwest of Elefsina and 22 km northwest of Athens city centre. The western part of the municipal unit is covered by Mount Pateras. There is a large industrial zone near the coast. The municipal unit of Mándra has a land area of 205.770 km. The municipal unit also includes the villages of Néa Zoí, Ágios Sotír, Palaiochóri, Diódia, Pournári and several smaller settlements. Mandra is bypassed by the Greek National Road 3 (Elefsis - Thiva).

Year	Town population	Municipal unit population
1981	8,804	-
1991	10,012	11,343
2001	10,947	12,792
2011	11,327	12,888
2021	11,126	12,365

• Vice Admiral Alexandros Sakellariou (1889–1982), ex-minister of Defense

• Official website (in Greek)