Washington National Opera (WNO) is an American opera company in Washington, D.C. Formerly the Opera Society of Washington and the Washington Opera, the company received Congressional designation as the National Opera Company in 2000. Performances are now given in the Opera House of the John F. Kennedy Center for the Performing Arts.

Opera in Washington, DC had become established after World War I and it did flourish for a time as the Washington National Opera Association until the Depression and World War Two years, and into the 1960s in various outdoor opera venues. However, with the establishment of the Opera Society of Washington in 1956–57, the way was laid for a company to function in the city, especially after the opening of the Kennedy Center in 1971 and its move there in 1979.

After making initial appearances with the company from 1986 onwards, tenor Plácido Domingo took over as general director in 1996, a post which he held until June 2011, after which the company, which was undergoing financial problems, came under the auspices of the Kennedy Center administration.