Seesen
| Seesen   | |
|---|---|
| Sehusa Castle | |
| Location of Seesen   within Goslar   district | |
| Coordinates: 51°53′35″N 10°10′42″E / 51.89306°N 10.17833°E | |
| Country | Germany | 
| State | Lower Saxony | 
| District | Goslar | 
| Government | |
| • Mayor (2019–24) | Erik Homann (CDU) | 
| Area | |
|  • Total | 102.32 km2 (39.51 sq mi) | 
| Elevation | 205 m (673 ft) | 
| Population  (2023-12-31) | |
|  • Total | 18,719 | 
| • Density | 180/km2 (470/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| Postal codes | 38723 | 
| Dialling codes | 05381 | 
| Vehicle registration | GS | 
| Website | |
Seesen (German pronunciation: [ˈzeːzn̩] ⓘ) is a town and municipality in the district of Goslar, in Lower Saxony, Germany. It is situated on the northwestern edge of the Harz mountain range, approx. 20 km (12 mi) west of Goslar.