Munna Bhai M.B.B.S. (translation: Munna Bro M.B.B.S.) is a 2003 Indian Hindi-language comedy drama film written and directed by Rajkumar Hirani in his directorial debut and produced by Vidhu Vinod Chopra under the banner Vinod Chopra Films. It features Sunil Dutt in his final film role as the father to his real-life son, Sanjay Dutt, who stars as the titular character. Gracy Singh, Jimmy Sheirgill, Arshad Warsi, Rohini Hattangadi and Boman Irani play other roles. It is a copy of 1998 hollywood film Patch Adams featuring Robin Williams.

The first installment of the Munna Bhai film series, the film follows Munna Bhai, a don in the Mumbai underworld, trying to please his father by pretending to be a doctor, but when a doctor, Asthana (Irani), exposes his lies and tarnishes his father's honor, Munna enrolls in a medical college. Chaos ensues when Munna, upon finding that Asthana is the dean of the college, vows revenge, while also sparking a romance with a house doctor, Suman (Singh), unaware that she is his childhood friend and Asthana's daughter. The film was followed by its sequel, Lage Raho Munna Bhai (2006).

Released on 19 December 2003, the film was a major critical and commercial success, and went on to win the 2004 National Film Award for Best Popular Film, and several Filmfare Awards, including the Best Film (Critics) and Best Screenplay. At the box office, it achieved a silver jubilee status (25-week run) being one of only eight Hindi films to have achieved this status since the year 2000. In its 26th week of release, the film could still be found playing on 300 screens throughout India. The film's release was also accompanied by a mobile video game based on the film by Indiagames.