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A film poster is a poster used to promote and advertise a film. Studios often print several posters that vary in size and content for various domestic and international markets. They normally contain an image with text. Today's posters often feature photographs of the main actors. Prior to the 1990s, illustrations instead of photos were far more common. The text on film posters usually contains the film title in large lettering and often the names of the main actors. It may also include a tagline, the name of the director, names of characters, the release date, etc.

Film posters are displayed inside and on the outside of movie theaters, and elsewhere on the street or in shops. The same images appear in the film exhibitor's pressbook and may also be used on websites, DVD (and historically VHS) packaging, flyers, advertisements in newspapers and magazines, etc.

Film posters have been used since the earliest public exhibitions of film. They began as outside placards listing the programme of (short) films to be shown inside the hall or movie theater. By the early 1900s, they began to feature illustrations of a film scene or an array of overlaid images from several scenes. Other posters have used artistic interpretations of a scene or even the theme of the film, represented in a wide variety of artistic styles.

Originally, film posters were produced for the exclusive use by the theaters exhibiting the film the poster was created for, and were required to be returned to the distributor after the film left the theater. In the United States, film posters were usually returned to a nationwide operation called the National Screen Service (NSS) which printed and distributed most of the film posters for the studios between 1940 and 1984. As an economy measure, the NSS regularly recycled posters that were returned, sending them back out to be used again at another theater. During this time, a film could stay in circulation for several years, and so many old film posters were badly worn before being retired into storage at an NSS warehouse (most often, they were thrown away when they were no longer needed or had become too worn to be used again). Those posters which were not returned were often thrown away by the theater owner, but some found their way into the hands of collectors.

Beginning in the 1980s, the American film studios began taking over direct production and distribution of their posters from the National Screen Service and the process of making and distributing film posters became decentralized in that country.

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