Love Aaj Kal (transl. Love These Days / Love Today and Yesterday) is a 2009 Indian Hindi-language romantic comedy-drama film written and directed by Imtiaz Ali and produced by Saif Ali Khan and Dinesh Vijan under the production of Illuminati Films and Maddock Films. Starring Khan and Deepika Padukone, it features Rishi Kapoor and Giselli Monteiro in supporting roles with Neetu Singh in a special appearance. The film follows Jai and Meera's journey, and portrays the feeling of pure love which never changes, although the perspective of realizing one's soulmate has changed over time.

Love Aaj Kal was released theatrically in India and worldwide on 31 July 2009. Produced on a budget of ₹35 crore, the film emerged as a critical and commercial success at the box-office, grossing ₹120 crore worldwide, ranking as the second-highest grossing Hindi film of the year. Upon release, it received positive reviews from critics for its novel concept, story, screenplay, direction, dialogues, soundtrack, humor, costumes, cinematography and performances of the cast.

Love Aaj Kal led the 55th Filmfare Awards with 12 nominations including Best Film, Best Director (Ali), Best Actor (Khan) and Best Actress (Padukone), and won 2 awards – Best Lyricist (Irshad Kamil for "Aaj Din Chadheya") and Best Choreography (Bosco–Caesar for "Chor Bazaari").

Love Aaj Kal was remade in Telugu as Teen Maar (2011). A spiritual successor of the same name directed by Ali, starring Kartik Aaryan with Khan's daughter Sara Ali Khan, was released in 2020.