The Visoki Dečani Monastery is a medieval Serbian Orthodox Christian monastery located near Deçan, Kosovo. It was founded in the first half of the 14th century by Stefan Dečanski, King of Serbia.

Dečani is by far the largest medieval church in the Balkans and one of the most complex architectural achievements of the 14th century. Its architectural style, which emerged in Kingdom of Serbia at the end of the 12th century, combines Orthodox traditions with Romanesque influences. The monastery reflects the cultural exchange between the East and West, representing Serbia's historical position during the medieval period. The Dečani church contains frescos that show defining moments from both Serbian history and Christian tradition. It also features the largest preserved collection of Byzantine painting. For centuries, Dečani has played a key role in preserving the spiritual, cultural, and national identity of Serbs in Kosovo.

Dečani is often considered to be one of the most endangered European cultural heritage sites. The monastery has been under the legal protection of Serbia since 1947 and is part of the World Heritage list titled "Medieval Monuments in Kosovo", designated as a Cultural Monument of Exceptional Importance.