Veľký Meder
Veľký Meder 
    Nagymegyer  | |
|---|---|
| Etymology: Great Megyer deriving from the name of the ancient Hungarian Megyer tribe | |
Location of Veľký Meder in the Trnava Region Location of Veľký Meder in Slovakia  | |
| Coordinates: 47°52′N 17°46′E / 47.86°N 17.77°E | |
| Country | Slovakia | 
| Region | Trnava Region | 
| District | Dunajská Streda District | 
| First mentioned | 1268 | 
| Area | |
 • Total  | 55.55 km2 (21.45 sq mi) | 
| Elevation | 112 m (367 ft) | 
| Population  (2021)  | |
 • Total  | 8,277 | 
| Ethnicity | |
| Time zone | UTC+1 (CET) | 
| • Summer (DST) | UTC+2 (CEST) | 
| Postal code | 932 01  | 
| Area code | +421 31 | 
| Car plate | DS | 
| Website | www | 
Veľký Meder (1948–1990 Čalovo, Hungarian: Nagymegyer, Yiddish: Magendorf) is a town in the Dunajská Streda District, Trnava Region in southwestern Slovakia.