I by Day, You by Night (German: Ich bei Tag und du bei Nacht) is a 1932 German musical comedy film directed by Ludwig Berger and starring Käthe von Nagy and Willy Fritsch.

It was shot at the Babelsberg Studios and on location at the Sanssouci Palace in Potsdam.

The film's sets were designed by the art director Otto Hunte.

[1] As was common at the time, separate English and French-language versions were released, both directed by Berger.

Greta, a manicurist, and Hans, a waiter, share the same room which he uses in the day and she at night due to their different working hours.