The Hanoi Opera House (Vietnamese: Nhà hát lớn Hà Nội) is an opera house in central Hanoi, Vietnam. It was erected by the French colonial administration between 1901 and 1911. It was modeled on the Palais Garnier, the older of Paris's two opera houses, and is considered to be one of the architectural landmarks of Hanoi.
The Hanoi Opera House provides the name for the nearby Hilton Hanoi Opera Hotel which opened in 1999 and which, for historical reasons associated with the Vietnam war, was not named the Hanoi Hilton.
The Saigon Opera House is a smaller structure built around the same time.