Altzella Abbey, Cistercian monastery ruins in Nossen, Germany.

Altzella Abbey comprises romanesque portals and brick gothic structures alongside various monastic buildings set within a park landscape. The remains include the lay brothers house and conventual quarters that showcase medieval architectural styles.

In 1162 Emperor Frederick I granted 800 Hufen of cleared land to the monastery founded by Otto of Meissen, and after silver was found near Freiberg in 1168 part of it was exchanged for a bishop's fief west of Nossen. In 1175 the first abbot arrived with twelve monks from Pforta Abbey, and the church was dedicated in 1198. Henry IV ordered the abbey's secularisation around 1540.

The abbey became the Wettin burial place in 1190, when Otto of Meissen was entombed here; the family used it until 1381. St Andrew's Chapel was built between 1339 and 1349 for the margraves, and Frederick the Serious and Frederick the Strict were buried there. Between 1676 and 1787 the Saxon electors had their ancestors' remains moved into the present mausoleum.

The site offers some wheelchair access via ramps at the lay brothers building and has designated parking available. An information desk can answer questions about the grounds and help orient visitors.

The upper storey of the lay brothers' building served as a library hall from 1506, and Abbot Martin von Lochau raised its holdings to 1,000 volumes. These books later formed the founding stock of Leipzig University Library. The building survived later demolition because it was used as a granary and cattle stall.