The Hanoi Opera House (Vietnamese: Nhà hát lớn Hà Nội) is an opera house in downtown Hanoi, Vietnam. It was erected by French colonists between 1901 and 1911.
The Hanoi Opera House is considered to be a typical French colonial architectural monument in Vietnam and is also a small-scale replica of the Palais Garnier, the older of Paris's two opera houses.
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.