The Complex of Huế Monuments (Vietnamese: Quần thể di tích Cố đô Huế) is a UNESCO World Heritage Site located in the city of Huế, central Vietnam. It was created in 1802 as the capital of newly unified Vietnam during the reign of Emperor Gia Long. Huế was an important center for politics, culture, and religion in the empire.

The complex includes three main areas: Hoàng thành (the Imperial City), Kinh thành (the Citadel), and Tử Cấm Thành (the Purple Forbidden City). It also includes other monuments outside the city, such as the tombs of emperors Gia Long, Minh Mạng, Thiệu Trị, Tự Đức, Dục Đức, Đồng Khánh, and Khải Định, as well as temples, pagodas, and other spiritual sites.

The buildings in the Complex of Huế Monuments are arranged according to traditional Vietnamese beliefs about the environment, called geomancy, and the Five Elements. These include the Five Cardinal Points (center, west, east, north, south), the Five Elements (earth, metal, wood, water, fire), and the Five Colors (yellow, white, blue, black, red).

The architecture of the complex follows a design based on the compass, with three layers: the outer layer is a wall, the middle layer is the imperial citadel, and the innermost layer is the imperial palace. The site’s natural geography includes a river and mountain, which are important features from northern to southern Vietnam. The royal buildings in Huế combine traditional Vietnamese styles, the best features of Chinese art, and elements chosen based on national traditions. Some designs also reflect influences from French architects who worked for Emperor Gia Long.