Operetta (German: Operette) is a 1940 musical film directed by Willi Forst and starring Forst, Maria Holst and Dora Komar. The film was made by Wien-Film, a Vienna-based company set up after Austria had been incorporated into Greater Germany following the 1938 Anschluss. It is the first film in director Willi Forst's "Viennese Trilogy" followed by Vienna Blood (1942) and Viennese Girls (1945). The film portrays the life of Franz Jauner (1832–1900), a leading musical figure in the city. It is both an operetta film and a Wiener Film.

Comedy with Hans Moser as grumpy valet who takes corrective action with mumbling peevishness in the fortunes of his family household count.

After a shady collector of paintings has been murdered, adept Dr. Sebastian Ott discovers a big organised fraud with fake paintings. His twin brother Ludwig is responsible for it, kidnaps him and locks him away in his house. He uses Otts ID and 'replaces' him...

A poor composer who should buy a property for his ambitious father-in-law finances with the money, nevertheless, an opera. Together with his friend who must play a husband to his strict rich aunt, he makes to himself a fun from the mistakes which cause her feints.

Diplomat Fürst Windischberg is known for spending too much time with women, receiving frequent reprimands and even a threat to be sent to Afrika. In Berlin he meets chorus girl Hella, who tells her companions she is his current flirt.

Morris Brown, a New York gambler acquainted more with his checkbook than his prayer book, returns to Galicia with his very American daughter, Mollie (Molly Picon) for a family wedding. But Mollie, whose exuberant antics fill the film, unexpectedly meets her match--an engaging young yeshiva scholar who forsake tradition and joins the secular world to win her heart.