A Waltz Dream

Ein Walzertraum (A Waltz Dream) is an operetta by Oscar Straus with a German libretto by Leopold Jacobson and Felix Dörmann (), based on the novella Nux, der Prinzgemahl (Only the Prince Consort) by Hans Müller-Einigen from his 1905 book Buch der Abenteuer (Book of Adventures).

The young Jacobson presented Straus with a libretto for Ein Walzertraum at a coffee house in the Vienna Prater in 1906. Straus was inspired by the text and completed the work within 12 months for its premiere in spring 1907.

It premiered on 2 March 1907 at the Carltheater in Vienna.

Following the success of the operetta in Vienna, productions of the work, under the name A Waltz Dream, were mounted in English for premieres at the Chestnut Street Opera House in Philadelphia on 6 January 1908, in New York City at the now-demolished Broadway Theatre on 27 January 1908 (with an English libretto adapted by Joseph Herbert), and in London on 28 March 1908 at the Hicks Theatre (adapted by Basil Hood, with lyrics by Adrian Ross, starring Gertie Millar, W. H. Berry and later Robert Evett, Jessie Broughton and Arthur Williams). Lily Elsie and Amy Evans starred in the 1911 revival at Daly's Theatre.

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