| Type: | Stadt |
| Image Coa: | Wappen Bad Koestritz.svg |
| Coordinates: | 50.9306°N 12.0097°W |
| Image Plan: | Bad Köstritz in GRZ.png |
| State: | Thüringen |
| District: | Greiz |
| Elevation: | 203 |
| Area: | 20.34 |
| Postal Code: | 07586 |
| Area Code: | 036605 |
| Licence: | GRZ |
| Gemeindeschlüssel: | 16 0 76 003 |
| Website: | www.stadt-bad-koestritz.de |
| Mayor: | Oliver Voigt[1] |
| Leader Term: | 2021 - 27 |
| Party: | FWG |
Bad Köstritz is a town in the district of Greiz, in Thuringia, Germany. It is situated on the White Elster river, 7 km northwest of Gera. Bad Köstritz is known for the Köstritzer brewery and its Schwarzbier (black beer).
The settlement was first mentioned in 1364 as Kostricz, a place of Slavic foundation. There has been a castle since the middle of the 13th century. The city has emerged from two medieval manors.
Within the German Empire (1871–1918), Köstritz was part of the Principality of Reuss-Gera. Köstritz Castle, a four-winged building around a courtyard built between 1687 and 1704, was the seat of a side wing of the ruling House of Reuss, named counts and (from 1806) princes Reuss-Köstritz. The castle was demolished in 1972 under the government of East Germany, with only the gatehouse left. Today, a modern hotel has been built on the site. In January 2023 Bad Köstritz absorbed the former municipality Hartmannsdorf.[2]
Election in May 2014:[3]