Tezaab (transl. Acid) is a 1988 Indian Hindi-language romantic action drama film starring Anil Kapoor and Madhuri Dixit in lead roles. The film gave Dixit her first big break, making her an overnight star in addition to reaffirming Kapoor's superstar status, after a successful Mr. India (1987). The film was directed, produced, and co-written by N. Chandra. The music was composed by Laxmikant–Pyarelal.

Tezaab was released on 11 November 1988 and was a major commercial success at the box office, becoming the highest-grossing Indian film of the year. It ran in theatres for more than 50 weeks, becoming a golden jubilee success. With Tezaab, N. Chandra scored a box office hat-trick with his previous hits Ankush (1986) and Pratighaat (1987). The film is also popular for the song "Ek Do Teen", which was a chartbusting success. It received positive reviews from critics and viewers upon release, with praise for its story, screenplay, dialogues, soundtrack, and performances of the cast.

At the 34th Filmfare Awards, Tezaab received a leading 12 nominations, Best Film, Best Director (Chandra), Best Actress (Dixit) and Best Supporting Actor (Panday), and won 4 awards, including Best Actor (Kapoor), Best Female Playback Singer (Alka Yagnik) and Best Choreography (Saroj Khan), the latter two for the song "Ek, Do, Teen". At the ceremony, Kapoor scored his first Best Actor win, while Dixit garnered her first-ever Best Actress nomination.

When Inspector Singh learns that a man, Munna, is about to reach his region of jurisdiction, he checks Munna's record. Munna is identified as Cadet Mahesh Deshmukh, whom he first met at the scene of a bank robbery in Nashik a few years prior, where Mahesh's parents and numerous other bank employees had been brutally murdered by a gang of thieves.

Following the bank incident, Inspector Singh finds Munna, rekindles their connection, and inquires as to his whereabouts. Munna reveals that he and his sister Jyoti had relocated to Bombay, where they had met Mohini, a poor and miserable woman who was compelled to dance in order to support her father, Shyamlal, a drunk man who does not want to marry Mohini off. He acted similarly against his wife, and when she disobeyed him, he attacked her with acid, resulting in her committing suicide.

In his youth, Shyamlal had taken a huge loan from Lotiya Pathan, a dreaded gangster, and the only way to repay it was to make Mohini dance. Shyamlal also has to deal with Chote Khan, the younger brother of Lotiya, who was involved in the robbery and the death of Mahesh's parents. Meanwhile, Mahesh and Mohini fall in love with each other while studying in the same college, where he joins a group of boys.

After being released on bail, Chote Khan attempts to rape Jyoti, but Mahesh kills him in self-defense. Mahesh is subsequently arrested and sentenced to one year in prison. After his release, Mahesh changes his name to Munna.

Upon learning Munna's backstory, Inspector Singh allows him to complete his mission under strict conditions. When Lotiya hears of Munna's return, he kidnaps Mohini. Shyamlal pleads with Munna to rescue her and insists that she be returned only to him. Munna successfully rescues Mohini, but although they are happy to reunite, Munna asks her to return to her father, leaving Mohini heartbroken. As promised, Munna surrenders to Inspector Singh, is tried in court, and sentenced to prison. After a retrial, Munna is acquitted and decides to start a new life in Goa. However, Jyoti convinces him not to abandon his love for Mohini. Munna sends his friends Guldasta and Baban to inform Mohini of his whereabouts. Shyamlal, overhearing Mohini's plans to escape, becomes enraged and attempts to stop her. In the ensuing conflict, Guldasta and Shyamlal are both killed, but Mohini manages to escape and reunites with Munna.