Oppam (transl. Along) is a 2016 Indian Malayalam-language crime thriller film directed by Priyadarshan from a story by Govind Vijayan. The film, produced by Antony Perumbavoor for Aashirvad Cinemas, stars Mohanlal and Samuthirakani. The songs were composed by the group 4 Musics, while the score was composed by Ron Ethan Yohann. The cinematography and editing were handled by N. K. Ekambaram and M. S. Ayyappan Nair and the story of the film is influenced by the basic threads of the 2011 Korean film Blind and the English film Cape Fear (1991 film) which itself was adapted from a novel.

Regular collaborators Mohanlal and Priyadarshan were expected to work on a film in 2015, but it was postponed before principal photography began until the following year. Priyadarshan decided to make another film with Mohanlal, and began looking at screenplays. They wanted a break from their usual comedy films. Priyadarshan agreed on a short story by Govind Vijayan which was suggested by Mohanlal. The director developed a plot and screenplay, which was on its final draft in February 2016. The film began principal photography in March and ended in June; it was filmed in Kochi, Ooty, Vagamon, Thiruvananthapuram, and Idukki.

Oppam was released in India on 8 September 2016 and internationally on 21 September 2016 where it received generally positive reviews from critics with praise for Mohanlal's performance and script. The film performed really well at the box office earning above ₹52 crores worldwide. It became the third-highest-grossing Malayalam film of all time and the second-highest-grossing Malayalam film of the year, behind Pulimurugan. At the Filmfare Awards South, the film was nominated in five categories (including Best Film, Best Director for Priyadarshan and Best Actor for Mohanlal) and won in the categories of Best Lyricist (for Madhu Vasudevan) and Best Male Playback Singer (for M. G. Sreekumar). It was dubbed and released in Telugu as Kanupapa on 3 February 2017, and in Hindi as Prime Witness. It was remade in Kannada in 2019 as Kavacha.