Schwarzbach is a municipality in the district of Greiz, in the state of Thuringia, Germany. It forms part of the Verwaltungsgemeinschaft (municipal association) of Münchenbernsdorf, a form of inter-municipal cooperation through which smaller communes share administrative functions.
The district of Greiz lies in eastern Thuringia, and Schwarzbach is one of the municipalities that make up this district alongside the town of Greiz itself. Its membership in the Münchenbernsdorf association places it within a group of neighbouring communes that jointly handle certain local government responsibilities.