| Type: | Ortsteil |
| Town: | Kuhfelde |
| Image Coa: | DE-ST 15-0-81-290 Siedenlangenbeck COA.png |
| Coordinates: | 52.75°N 11.0967°W |
| State: | Sachsen-Anhalt |
| District: | Altmarkkreis Salzwedel |
| Elevation: | 36 |
| Area: | 18.55 |
| Population: | 466 |
| Stand: | 2006-12-31 |
| Postal Code: | 29416 |
| Area Code: | 039035 |
| Licence: | SAW |
Siedenlangenbeck is a village and a former municipality in the district Altmarkkreis Salzwedel, in Saxony-Anhalt, Germany. Since 1 July 2009, it is part of the municipality Kuhfelde.