Grande-Synthe
| Grande-Synthe Groot-Sinten | |
|---|---|
| The town hall in Grande-Synthe | |
| Location of Grande-Synthe | |
| Coordinates: 51°00′50″N 2°18′10″E / 51.0139°N 2.3028°E | |
| Country | France | 
| Region | Hauts-de-France | 
| Department | Nord | 
| Arrondissement | Dunkerque | 
| Canton | Grande-Synthe | 
| Intercommunality | CU de Dunkerque | 
| Government | |
| • Mayor (2020–2026) | Martial Beyaert | 
| Area 1 | 21.44 km2 (8.28 sq mi) | 
| Population  (2022) | 20,347 | 
| • Density | 950/km2 (2,500/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| INSEE/Postal code | 59271 /59760 | 
| Elevation | 2 m (6.6 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Grande-Synthe (French pronunciation: [ɡʁɑ̃d sɛ̃t]; West Flemish: Groot-Sinten) is a commune in the Nord department in the Nord-Pas de Calais region in northern France.
It is the third-largest suburb of the city of Dunkerque (Dunkirk) and lies adjacent to it on the west.