Most of the movie was filmed on location in London, at sites including Trafalgar Square, the central court of Somerset House in the Strand, Grosvenor Chapel on South Audley Street near Hyde Park, St. Paul's Clapham on Rectory Grove, Clapham in the London Borough of Lambeth, the Millennium Bridge, Selfridges department store on Oxford Street, Lambeth Bridge, the Tate Modern in the former Bankside Power Station, Canary Wharf, Marble Arch, the St. Lukes Mews off All Saint's Road in Notting Hill, Chelsea Bridge, the OXO Tower, London City Hall, Poplar Road in Herne Hill in the London Borough of Lambeth, Elliott School in Pullman Gardens, Putney in the London Borough of Wandsworth, and London Heathrow Airport. Additional scenes were filmed at the Marseille Airport and Le Bar de la Marine. Scenes set in 10 Downing Street were filmed at the Shepperton Studios.
Ant and Dec played themselves in the film (in which Bill Nighy's character referred to Dec as "Ant or Dec"). This refers to the common mistaking of one for the other, owing to their constant joint professional presence as a comedy and presenting duo. Veteran actress Jeanne Moreau is seen briefly, entering a taxi at the Marseille Airport. Soul singer Ruby Turner appears as Joanna Anderson's mother, one of the backup singers at the school Christmas pageant.
Curtis' original concept for the film included 14 different scenarios, but four of them were cut (two after having been filmed). The scene in which Colin attempts to chat up the female caterer at the wedding appeared in drafts of the screenplay for Four Weddings and a Funeral, but was cut from the final version. The Music Video for Billy Mack's Song, "Love Is All Around", is a tribute to Robert Palmer's video, "Addicted To Love". After the resignation of PM Tony Blair, pundits and speculators referred to a potential anti-American shift in Gordon Brown's cabinet as a "Love Actually moment," referring to the scene in which Hugh Grant's character stands up to the American president. In 2009, during President Barack Obama's first visit to the UK, Chris Matthews referred to the president in Love Actually as an example of George W. Bush and other former presidents' bullying of European allies. In commenting on Matthews' view, Mediaite's Jon Bershad described the U.S. president character as a "sleazy Bill Clinton/George W. Bush hybrid". In the scene in question, the swaggering president bullies the prime minister and then sexually harasses a member of the P.M.'s household staff. In September 2013, David Cameron made a speech in reply to Russia's comment that Britain was a small insignificant country which drew comparisons with Hugh Grant's speech during the film.