| Coordinates: | 51.2314°N 10.1664°W |
| Image Plan: | Geismar in EIC.svg |
| State: | Thüringen |
| District: | Eichsfeld |
| Verwaltungsgemeinschaft: | Ershausen/Geismar |
| Elevation: | 210 |
| Area: | 19.32 |
| Postal Code: | 37308 |
| Area Code: | 036082 |
| Licence: | EIC |
| Gemeindeschlüssel: | 16 0 61 035 |
| Website: | www.ershausen-geismar.de |
| Mayor: | Martin Kozber[1] |
| Leader Term: | 2022 - 28 |
| Party: | CDU |
Geismar is a municipality in the district of Eichsfeld in Thuringia, Germany.
