Altenberg Abbey, Solms, Premonstratensian nunnery in Solms, Germany.

Altenberg Abbey stands on the Michelsberg above the Lahn between Solms and Wetzlar. Its 13th-century church has pale cream walls, dark slate roofs, a steep hipped roof with a slender spire and cross behind the ridge, a polygonal projection with pyramidal roof and golden finial at the left front, and tall pointed-arch windows with stone tracery. Convent and 17th-century economic buildings survive within an almost complete perimeter wall.

The monastery was founded around 1170 and maintained strong ties with the House of Nassau for centuries until its dissolution in 1802 during the secularization period. This ending marked the close of over 600 years of monastic life at this site.

The abbey church became a Protestant parish church after the 1802 dissolution. Since August 2023 no religious community has lived on site: the Christozentrische Gemeinschaft left when rising energy costs made its lease unaffordable. The buildings now serve as a meeting centre for the local deanery.

The site lies on the Michelsberg above the Lahn between Wetzlar and Solms-Oberbiel. The former abbey church, built between 1260 and 1270, is now a Protestant parish church and can be visited, as can the exhibition pieces in the sacred rooms of Braunfels Castle. The outer wall still encloses the complex almost completely; the residential buildings are no longer open to visitors since the Christocentric community left in August 2023.

The 1757 organ by Johann Wilhelm Schöler, with 23 stops on two manuals and pedal, survives almost unchanged apart from maintenance and small repairs. Its two earlier predecessors dated from 1452 and 1653. The limited keyboards and soft but colourful voicing were designed for its liturgical role in the church.