Grammatiko
| Grammatiko Γραμματικό | |
|---|---|
| Coordinates: 38°12′N 23°58′E / 38.200°N 23.967°E | |
| Country | Greece | 
| Administrative region | Attica | 
| Regional unit | East Attica | 
| Municipality | Marathon | 
| Area | |
| • Municipal unit | 51.674 km2 (19.951 sq mi) | 
| Elevation | 211 m (692 ft) | 
| Population  (2021) | |
| • Municipal unit | 1,383 | 
| • Municipal unit density | 27/km2 (69/sq mi) | 
| Time zone | UTC+2 (EET) | 
| • Summer (DST) | UTC+3 (EEST) | 
| Postal code | 190 07 | 
| Area code(s) | 22940 | 
| Vehicle registration | Z | 
Grammatiko (Greek: Γραμματικό) is a village in East Attica, Greece. Since the 2011 local government reform it is part of the municipality Marathon, of which it is a municipal unit. It is part of the Athens metropolitan area.