Grethem
| Grethem   | |
|---|---|
|  Coat of arms | |
| Location of Grethem   within Heidekreis   district   | |
|   Grethem     Grethem   | |
| Coordinates: 52°43′N 09°35′E / 52.717°N 9.583°E | |
| Country | Germany | 
| State | Lower Saxony | 
| District | Heidekreis | 
| Municipal assoc. | Ahlden | 
| Government | |
| • Mayor | Udo Schönberg | 
| Area | |
|  • Total | 16.35 km2 (6.31 sq mi) | 
| Elevation | 24 m (79 ft) | 
| Population  (2023-12-31)[1] | |
|  • Total | 656 | 
| • Density | 40/km2 (100/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| Postal codes | 29690 | 
| Dialling codes | 05164 | 
| Vehicle registration | FAL, SFA | 
| Website | www.grethem.de | 
Grethem is a municipality in the district of Heidekreis, in Lower Saxony, Germany.
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