The Trunks of Mr. O.F. (German: Die Koffer des Herrn O.F.) is a 1931 German comedy film directed by Alexis Granowsky and starring Alfred Abel, Peter Lorre and Harald Paulsen. The film was shot between 15 September and 17 October 1931 and premiered in Berlin on 2 December 1931. The film was then heavily cut down to a shorter running time, and re-released under the alternative title Building and Marrying (Bauen und heiraten). It received its Viennese premiere on 4 June 1932.
It received a mixed reception from critics who were divided over its non-realist, fantastical elements. The film's screenwriter Léo Lania intended it to be a critique of capitalism.