Kappel Abbey, Cistercian monastery in Kappel am Albis, Switzerland.

Kappel Abbey is a former Cistercian monastery in Kappel am Albis. Its oldest section is the core of the administration buildings, probably built in 1209/10 as a hospital and later used as the abbot's and prior's residence. A new early Gothic church was begun around 1255 on the site of the original church, parts of which survive in the present structure, and was completed in the early 14th century. The church choir holds a stained-glass work by the Swiss graphic artist and painter Max Hunziker.

Founded in 1185 by the Freiherren von Eschenbach-Schnabelburg and confirmed by Bishop Hermann II of Constance, the abbey received the Privilegium commune Cisterciense from Pope Innocent III in 1211. A fire destroyed the convent buildings on 15 January 1493; Abt Ulrich rebuilt them but was forced to resign in 1508. In 1523 Abbot Wolfgang Joner brought Heinrich Bullinger to teach, and by 1527 the monastery was abolished and handed to Zurich.

The name comes from a chapel where, by foundation legend, hermits once lived. In 1523 abbot Wolfgang Joner brought the nineteen-year-old Heinrich Bullinger to teach the monks and local boys; on 9 March 1525 the church images were removed and on 4 September the Mass was abolished. The former abbey church now serves as Kappel's parish church.

The complex is run by the cantonal Reformed church as a hotel with 79 rooms and seminar space; the church and parish house belong to the Canton of Zurich. Since 2023 a new apartment building and renovations are under way, and new parking is meant to free the inner courtyard of cars.

The Kappeler Milchsuppe of June 1529 was cooked in a pot set exactly on the border between Zurich and Zug: the Catholics supplied the milk, the Protestants the bread, and the leaders negotiated peace while the soldiers ate. On 11 October 1531 the two armies met again at Kappel, and the Zurich reformer Huldrych Zwingli was killed.