The Abbey of Saint Gall, located in St. Gallen, Switzerland, is a former Benedictine monastery and one of the oldest and most important cultural monuments in Switzerland. Founded in the 8th century, the abbey was one of the centers of learning and culture during the early Middle Ages. Over time, the abbey grew to become one of the largest and most powerful Benedictine monasteries in Europe, with a complex of buildings, including the abbey church, library, dormitory, and workshops. The abbey church is one of the most important examples of early medieval architecture and is considered a masterpiece of Carolingian art. The library of the abbey, with its collection of over 170,000 manuscripts, is also considered one of the most important libraries of the Middle Ages. In 1983, the Abbey of Saint Gall was designated a UNESCO World Heritage Site. Today, the abbey complex is used as a museum and cultural center, open to the public for visits and events.

The library of the Abbey of Saint Gall is particularly notable, as it is one of the oldest and most complete monastic libraries in the world. The collection of manuscripts and early printed books, which dates back to the 9th century, includes works on religion, history, literature, law, and science, and is considered a treasure trove of cultural and intellectual history. The library also houses many unique and important manuscripts, including the earliest known plan of a medieval monastery, which was created in the 9th century and provides a detailed layout of the original abbey complex. The library continues to be an important cultural and research center, and is used by scholars from all over the world for research and study.