Koni (Bengali: কোনি; sometimes spells as Koney or Kony) is a national award-winning Bengali movie released in 1984 directed by Saroj Dey, starring Soumitra Chatterjee and Sriparna Banerjee. This film is an adaptation of a Bengali novel by the same name written by Moti Nandi. The film is about a girl living in Calcutta slums, who with the help of her coach triumphs over poverty and hardships. The film's lead Sriparna Banerjee was also a professional swimmer herself in the 1970s and at the time of casting a student of Jadavpur University. The film was a smash hit at the west-bengal box-office. It also surpassess Shatru(1984) of Ranjit Mallick.

In a 2012 interview, veteran actor, Soumitra Chatterjee, called Koni one of the best films of his career. He even recalled using film's catch-phrase "Fight-Koni-fight" in hard times, as a chant to himself to lift his "aging spirits". The phrase had become popular with middle-class Bengalis at the time.