The Polish town of Kętrzyn was formerly known as Rastenburg.
| Type: | Stadt |
| Image Coa: | Wappen_Rastenberg.png |
| Coordinates: | 51.1761°N 11.4192°W |
| Image Plan: | Rastenberg in SÖM.png |
| State: | Thüringen |
| District: | Sömmerda |
| Verwaltungsgemeinschaft: | Kölleda |
| Elevation: | 205 |
| Area: | 35.42 |
| Postal Code: | 99636 |
| Area Code: | 036377 |
| Licence: | SÖM |
| Gemeindeschlüssel: | 16 0 68 042 |
| Mayor: | Beatrix Winter[1] |
| Leader Term: | 2024 - 30 |
Rastenberg is a town in the district of Sömmerda, in Thuringia, Germany. It is situated 22 km east of Sömmerda, and 23 km northeast of Weimar.
Within the German Empire (1871-1918), Rastenberg was part of the Grand Duchy of Saxe-Weimar-Eisenach.