The Glauberg is a Celtic hillfort or oppidum in Hesse, Germany consisting of a fortified settlement and several burial mounds, "a princely seat of the late Hallstatt and early La Tène periods." Archaeological discoveries in the 1990s place the site among the most important early Celtic centres in Europe. It provides unprecedented evidence on Celtic burial, sculpture and monumental architecture.

An oppidum is a large fortified Iron Age settlement or town. Oppida are primarily associated with the Celtic late La Tène culture, emerging during the 2nd and 1st centuries BC, spread across Europe, stretching from Britain and Iberia in the west to the edge of the Hungarian plain in the east. These settlements continued to be used until the Romans conquered Southern and Western Europe. Many subsequently became Roman-era towns and cities, whilst others were abandoned. In regions north of the rivers Danube and Rhine, such as most of Germania, where the populations remained independent from Rome, oppida continued to be used into the 1st century AD.