Alteburg, Mountain summit in Rhineland-Palatinate, Germany

Alteburg is a 620.5 m high mountain in the Soonwald, part of the Hunsrück, near the former village of Pferdsfeld in the Bad Kreuznach district. On its summit stand a nearly square rampart of unknown date, about 70 by 70 m with a collapsed wall up to 6 m wide at the base, and the 20 m Alteburgturm observation tower.

The 20-metre Alteburgturm was erected on the summit in 1893 by the Soonwald Club, the hiking association of the time; it is now owned by the Hunsrück-Verein and listed as a protected monument. The hilltop also holds a nearly square rampart, 70 by 70 metres, whose date and purpose remain unknown; it is thought to be a Celtic refuge fort from the La Tène period (500–20 BC).

The mountain forms part of the European long-distance path E3, connecting numerous peaks across multiple countries through an extensive hiking network.

The tower can be reached by climbing a spiral staircase with 67 steps that lead to the observation platform. The platform remains open to visitors and provides views across the surrounding landscape.

The almost square rampart beside the tower measures 70 by 70 metres, with a collapsed wall about one metre high and up to six metres wide at its base. Its date and purpose are unknown; it is thought to be a Celtic refuge fort from the La Tène period (500–20 BC).