"Edelweiss" is a show tune from the 1959 Rodgers and Hammerstein musical The Sound of Music. It is named after the edelweiss, a white flower found high in the Alps (Leontopodium nivale). The song was created for the 1959 Broadway production of The Sound of Music, as a song for the character Captain Georg von Trapp (originated by the performer Theodore Bikel). In the musical, Captain von Trapp and his family sing this song during the concert near the end of Act II, as a statement of Austrian patriotism in the face of the pressure put upon him to join the navy of Nazi Germany following the Anschluss (Nazi annexation of their homeland). It is also Captain von Trapp's subliminal goodbye to his beloved homeland, using the flower as a symbol of his loyalty to Austria. In the 1965 film adaptation, the song is also sung by the Captain earlier in the film when he rediscovers music with his children.

It was the last song ever written by Oscar Hammerstein II, prior to his death in August, 1960.

The great popularity of the song in the Anglosphere has led many of its audience to believe that it is an Austrian folk song or even the official national anthem. However, Austria's official anthem is "Land der Berge, Land am Strome", and the anthem used from 1929 until the Anschluss was "Sei gesegnet ohne Ende".

The edelweiss is a popular flower in Austria and was featured on the old Austrian 1 schilling coin. It can also now be seen on the 2 cent Euro coin. The flower is protected in Austria and illegal to pick. An "edelweiss" is also worn as a cap emblem by certain Austrian Army and the German Gebirgsjäger (mountain troopers) units stationed in the nearby Bavarian Alps