Hum Aapke Hain Koun..! (transl. Who am I to you?) also known by the initialism HAHK, is a 1994 Indian Hindi-language musical romantic drama film written and directed by Sooraj Barjatya and produced by Rajshri Productions. The film stars Madhuri Dixit and Salman Khan and celebrates Indian wedding traditions by means of a story of a married couple and the relationship between their families; a story about sacrificing one's love for one's family. The basic plot is based on studio's earlier film Nadiya Ke Paar (1982), which was based on Keshav Prasad Mishra's Hindi novel Kohbar Ki Shart. The film features music by Raamlaxman who also composed a 14-song soundtrack, an unusually large number of songs for that period.

Hum Aapke Hain Koun..! released on 5 August 1994, and became the highest-grossing film of the year, having grossed between ₹2 billion ($63.8 million) and ₹2.5 billion ($82 million) worldwide, It also became the highest-grossing Indian film at the time of its release. It contributed to a change in the Indian film industry, with new methods of distribution and a turn towards less violent stories. It was the first film to gross over ₹1 billion in India, and when adjusted for inflation, is the highest-grossing Indian film of the 1990s and also one of the highest-earning Bollywood films ever. Box Office India described it as "the biggest blockbuster of the modern era."At the 42nd National Film Awards, Hum Aapke Hain Koun..! won two awards, including the Best Popular Film Providing Wholesome Entertainment. At the 40th Filmfare Awards, the film received a leading 13 nominations, and won five awards, including Best Film, Best Director (Barjatya), Best Actress (Dixit) and Special Award (Lata Mangeshkar for "Didi Tera Devar Deewana"). It also won six awards at the newly-introduced Screen Awards.

Hum Aapke Hain Koun..! is considered as one of the most influential films in the Indian film industry as well as in pop culture. It made a lasting impact on wedding celebrations in India, which often include songs and games from the film. It is credited as being a defining moment in Hindi cinema's box office history, and the beginning of a revolution in the Indian film distribution system.