Grammatiko (Greek: Γραμματικό) is a village in East Attica, Greece.

[2] It is part of the Athens metropolitan area.

[3][4] Grammatiko is situated in the hills of the northeastern part of the Attica peninsula, 6 km from the South Euboean Gulf coast, at about 210 m elevation.

[5] Helios Airways Flight 522 crashed in the hills near Grammatiko on 14 August 2005 after a lack of cabin pressure incapacitated the aircraft's crew members.

[6] Grammatiko has historically been an Arvanite settlement.