Ershausen/Geismar is a municipal association (‹See Tfd›German: Verwaltungsgemeinschaft) in the district of Eichsfeld, in Thuringia, Germany. The seat of the municipal association is in Schimberg.
The association consists of the following municipalities:
- Dieterode
- Geismar
- Kella
- Krombach
- Pfaffschwende
- Schimberg
- Schwobfeld
- Sickerode
- Volkerode
- Wiesenfeld