The purpose of this paper is to expand readers' insights into the state of availability of documentary film in Croatian public libraries, to expand insights into the features and trends related to documentary film and its importance for libraries. The aim of the research is to determine how many documentaries are written in the collections of five selected Croatian public libraries in Croatia, in relation to other film genres that the library contains in its film collection. The paper would also analyze the documentaries available in the library according to the year in which they were made and according to the countries of production. The paper would also contain a brief history of documentary film and the current state and trends related to documentary film, so that the reader acquires a more complete general knowledge of this film genre. In addition to the collected data on the availability of documentaries in selected libraries, the paper would also design a project for showing a documentary film in one of the public libraries. The process would include finding an adequate documentary (among those already in the film collection of the selected library), explaining why showing the film would benefit the community, and designing various aspects of the whole film screening event: from poster design to screening organization. and finding and presenting other film and non-film library material that is closely related to the film being shown, so that, through projection, existing users are encouraged to borrow related library material, and so as to seek to interest potential new library users.