The Abbey of Fontenay is a former Cistercian abbey located in the commune of Marmagne, near Montbard in the Burgundy region of France. It was founded in 1118 by Saint Bernard of Clairvaux, one of the most important figures in the Cistercian movement. The abbey was built on a marshy plain, which was drained and transformed into a thriving center of agriculture and industry.

The abbey's church, which was built in the Romanesque style, is a masterpiece of Cistercian architecture. Its simple, austere design reflects the Cistercian ideal of poverty and humility. The church is notable for its wide nave, pointed arches, and ribbed vaults. The abbey's other buildings, including the cloister, the dormitory, the chapter house, and the forge, are also excellent examples of medieval architecture.

The Abbey of Fontenay was inhabited by Cistercian monks for nearly 700 years, until the French Revolution. During this time, the abbey played an important role in the religious, economic, and cultural life of Burgundy. Today, the abbey is a UNESCO World Heritage Site and a popular tourist destination. Visitors can tour the church and the other buildings, as well as the beautiful gardens and the surrounding countryside. The abbey also hosts a variety of cultural events throughout the year, including concerts, exhibitions, and workshops.