Once There Was a Waltz (German: Es war einmal ein Walzer) is a 1932 German operetta film directed by Victor Janson and starring Mártha Eggerth, Rolf von Goth and Paul Hörbiger.

It was shot at the Tempelhof Studios in Berlin with sets designed by the art director Jacek Rotmil.

The film was remade in Britain as Where Is This Lady?, released the same year.

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