Griesheim (German pronunciation: [ˈɡʁiːsˌhaɪ̯m] ⓘ) is the largest town in the Darmstadt-Dieburg district of Darmstadt in the southern state of Hesse.

More recently, in 2013, news of the Dagger Complex—which emerged as the most important of the NSA's headquarters in Europe in the wake of the global surveillance disclosures—brought Griesheim worldwide attention.

Griesheim is located in the Hessian Ried between the Urneckar in the west and the Darmstadt Westwald forest area in the east.

However, the devastating impact of the Thirty Year War heavily affected Griesheim, almost bringing the town to extinction.

From 1918 to 1930, Griesheim was under French occupation, and during World War II, the city suffered significant damage, with 65% of its buildings destroyed.

The city is home to a local history and culture museum, showcasing archaeological artifacts and documenting its historical connection to St. Stephen.