Once You Give Away Your Heart (German: Wenn du einmal dein Herz verschenkst) is a 1929 German comedy film directed by Johannes Guter and starring Lilian Harvey, Igo Sym, and Harry Halm.

The film's art direction was by Heinz Fenchel and Jacek Rotmil.

It was shot at the Babelsberg Studios and on location in Tenerife and on board a cargo steamer sailing from Hamburg.

A young woman escapes from the banana plantation in Borneo where she lives and travels on a cargo ship to Europe.

This article related to a German film of the 1920s is a stub.