| Image Coa: | Wappen Langenwetzendorf.png |
| Coordinates: | 50.6769°N 12.0981°W |
| Image Plan: | Langenwetzendorf in GRZ.png |
| State: | Thüringen |
| District: | Greiz |
| Elevation: | 338 |
| Area: | 58.41 |
| Postal Code: | 07957 |
| Area Code: | 036625 |
| Licence: | GRZ |
| Gemeindeschlüssel: | 16 0 76 039 |
| Website: | www.langenwetzendorf.de |
| Mayor: | Kai Dittmann[1] |
| Leader Term: | 2021 - 27 |
| Party: | CDU |
Langenwetzendorf is a municipality in the district of Greiz, in Thuringia, Germany.
Within the German Empire (1871-1918), Langenwetzendorf was part of the Principality of Reuss-Gera. In January 2023 Langenwetzendorf absorbed the former municipality Kühdorf.[2]