Altenburg Abbey, Benedictine monastery in Altenburg, Austria.

Altenburg Abbey is a Benedictine monastery on a rock plateau above the Kamptal, its 208-metre east front centred on the oriented abbey church with a projecting choir. North of the centre lies the Marble Wing with its Sala terrena, south the library wing above the crypt; west of this front, courtyards are enclosed by further wings.

The monastery was founded in 1144 by Countess Hildeburg of Poigen-Rebgau and later suffered severe destruction during the Hussite Wars and the Swedish invasion of 1645. The Baroque form visible today emerged from rebuilding efforts that followed these destructive periods.

The gardens here combine five distinct areas inspired by world religions with natural spaces like ponds and wildflower meadows. Visitors walk through these areas and experience how spiritual ideas are reflected in the landscape design.

The abbey stands on a rock plateau above the Kamptal, south of Altenburg's village centre, about 30 km north of Krems an der Donau. The 208-metre east front holds the church in its middle, with the Marble Wing to the north and the library wing with the crypt to the south. The complex is a listed monument; the church tower was under basic renovation from 2002.

Beneath the Baroque church lies a medieval "monastery beneath the monastery", excavated by the Federal Monuments Office between 1983 and 2005. The finds include a refectory, a chapter house, monks' living quarters, a cloister, a scriptorium and a Gothic St. Vitus Chapel, reached today from the terrace in front of the church.