Citadel of the Hồ Dynasty (Vietnamese: Thành nhà Hồ, chữ Nho: 城茹胡; also called Tây Đô/西都castle or Tây Giai castle) is a 15th century stone fortress in Thanh Hóa, Vietnam.

It served as the western capital of the Hồ dynasty (1398–1407) while also being an important political, economic, and cultural centre in the 16th to the 18th century.

It is located in modern Tây Giai commune, Vĩnh Lộc District, in Thanh Hóa Province, in Vietnam's North Central Coast region.

It was composed of an Inner Citadel made of limestone, the La Thanh Outer Wall and a 155 hectare altar.

The design and decoration of architectural elements in terms of space management was meant to showcase a centralized imperial city ruled by royal power, based on Confucianism mixed with a Buddhist culture.