Kuch Kuch Hota Hai (transl. Something Happens) is a 1998 Indian Hindi-language romantic comedy-drama film written and directed by Karan Johar, in his directorial debut, and produced by Yash Johar under Dharma Productions. It stars Shah Rukh Khan, Kajol, Rani Mukerji, Salman Khan and Sana Saeed. Set primarily across two time periods, the narrative follows college friends Rahul, Anjali, and Tina in the first half, and later, Rahul’s young daughter’s attempt to reunite him with his former best friend.

The film was shot in India, Mauritius, and Scotland, with Johar intending to bring a contemporary visual style to mainstream Hindi cinema. The soundtrack was composed by Jatin–Lalit, with lyrics by Sameer; it became the highest-selling Bollywood music album of the year.

Kuch Kuch Hota Hai was released theatrically on 16 October 1998, coinciding with the Diwali weekend. It received generally positive reviews from critics, who praised its direction, performances, music, cinematography, and emotional resonance. The film was a major commercial success, emerging as the highest-grossing Hindi film of 1998 in India and, at the time, the third highest-grossing Indian film overall. Internationally, it became the highest-grossing Hindi film ever until the release of Johar’s subsequent directorial, Kabhi Khushi Kabhie Gham... (2001).

The film won numerous awards, including the National Film Award for Best Popular Film Providing Wholesome Entertainment. At the 44th Filmfare Awards, it won eight awards, including Best Film, Best Director, and all four acting categories (Best Actor, Best Actress, Best Supporting Actor, and Best Supporting Actress)—a distinction unmatched until Gully Boy (2019). It also received honors at the Screen Awards, Zee Cine Awards, and Bollywood Movie Awards. The film remains a landmark in Hindi cinema for its cultural impact, music, and fashion influence.