Hum Tum (transl. Me and You) is a 2004 Indian Hindi-language romantic comedy film written and directed by Kunal Kohli. Produced by Aditya Chopra under his banner Yash Raj Films, it is loosely based on the English film When Harry Met Sally... (1989). The film stars Saif Ali Khan and Rani Mukerji, with Rishi Kapoor, Kirron Kher, Rati Agnihotri and Jimmy Sheirgill. Hum Tum follows the encounters of two individuals, Karan and Rhea, who run into each other on several occasions under various circumstances.

Hum Tum marked Mukerji's third film with Yash Raj Films. The film has several short animation sequences, which were created by Kathaa Animations headed by Prakash Nambiar, with special effects done by Tata Elxsi. The cinematography is done by Sunil Patel. Jatin–Lalit composed the music, while lyrics were written by Prasoon Joshi.

Hum Tum was released theatrically on 28 May 2004 and received mixed-to-positive reviews from critics, with praise for its direction, soundtrack and cast performances, but criticism for its script. It had an above-average opening and was a major success at the box office, with a gross of ₹43.22 million (US$500,000). The film became the sixth highest-grossing film of the year.

The film received several accolades. At the 52nd National Film Awards in 2005, Khan was awarded the National Film Award for Best Actor. At the 50th Filmfare Awards, Hum Tum received 8 nominations and won 5 awards, including Best Director (Kohli), Best Actress (Mukherji), Best Comedian (Khan), Best Female Playback Singer (Alka Yagnik for "Hum Tum"), and Best Scene of the Year.