Geisa is a town in the Wartburgkreis district, in Thuringia, Germany. It is situated in the Rhön Mountains, 26 km northeast of Fulda. The near border with Hesse was the border between West Germany and the GDR during the Cold War. Thus, Geisa was in the East German border restriction area of the former inner German border, which meant that until reunification access to the town was limited. The town is the westernmost municipality in what was formerly East Germany.

Thuringia, officially the Free State of Thuringia, is a state of central Germany, covering 16,171 square kilometres (6,244 sq mi), the sixth smallest of the sixteen German states. It has a population of about 2.1 million.