Cyanide is an Indian 2006 Kannada-language drama film written and directed by A. M. R. Ramesh. The plot of the film set in and around Bangalore from 1st to 20th August 1991, deals with incidents surrounding the assassins of former Indian Prime Minister Rajiv Gandhi. It stars Ravi Kale as Sivarasan (One-eyed Jack), the mastermind of the assassination. Malavika Avinash, Tara, Rangayana Raghu in pivotal roles. The supporting cast features Avinash, Nassar and Suresh Heblikar. The film was dubbed in Tamil as Kuppi.

Upon theatrical release on 7 July 2006, the film received widespread critical acclaim. Critics acclaimed the film's narration, the acting performances of Ravi Kale, Rangayana Raghu, Tara and Malavika Avinash, and the camerawork and editing of the film. At the 2006–07 Karnataka State Film Awards the film won two awards – Third Best Film and Best Actress (Tara). For his portrayal of Ranganath, who sheltered the assassins, Raghu was awarded the Best Supporting Actor at the 54th Filmfare Awards South. The film is seen by some critics as one of the finest films ever made in Kannada cinema.