This list charts the most successful films at cinemas in the United Kingdom (a box office territory that also includes Republic of Ireland), by box office sales in pounds sterling and admissions. An overview of the top-earning films and record-holders is provided, as well as the highest-grossing British productions, the most successful non-English-language films and the sound films that have generated the most admissions. A summary of the most popular films over the course of the last century is also included.
American productions dominate, with all films earning over £50 million at the box office either completely or partly produced by Hollywood studios. British film is well represented, with about half the films on the list qualifying as British productions; however, due to the globalization of the film industry most successful British productions since the start of the twenty-first century have been co-produced with other countries. While there is no universally accepted definition of a film's nationality, a legal definition for the Britishness of a film has existed in UK law since 2007, and this is the criteria used here. For films made prior to 2007, the nationalities listed by the sources supplying the data are used where they are given.
The 2015 Star Wars film, The Force Awakens, is the highest-grossing film in terms of nominal box-office sales. The effects of inflation are a significant contributing factor to recent films surpassing the box-office records of older films, so when considering the number of admissions Gone with the Wind (1940) is the most successful film, although this was achieved over several release cycles prior to the home video era.