O Kadhal Kanmani received positive reviews from critics upon release, with International Business Times India calling it "the director's best in recent years" in their initial review round-up. Baradwaj Rangan of The Hindu wrote, "O Kadhal Kanmani is something of a greatest-hits package of Mani Ratnam", while also singling out Nithya Menen's performance for praise. He added "we’re all going to have our favourite scenes with her" and "if Mani Ratnam keeps employing actors like her, he may not need to write those zingers anymore." Anupama Subramanian of Deccan Chronicle wrote, "After a couple of lackluster flicks, master story teller Mani Ratnam is back with a bang with a feel good complete romantic movie O Kadhal Kanmani.
O Kadhal Kanmani (lit. Oh love, apple of my eye), also known as OK Kanmani, is a 2015 Indian Tamil-language romantic drama film written, directed and produced by Mani Ratnam. The film stars Dulquer Salmaan and Nithya Menen in the lead roles, portraying a young couple in a live-in relationship in Mumbai. Prakash Raj and Leela Samson play supporting roles as an older couple in the film, portraying the younger couple's landlords. The film was said to be a "reflection of the modern mindset of urban India", dealing with issues such as marriage and traditional values.
The film featured music composed by A. R. Rahman, cinematography by P. C. Sreeram and editing by Sreekar Prasad. Prior to the film's release, the soundtrack was well received and the promotional activity of the film on social media also garnered praise. O Kadhal Kanmani was released on 17 April 2015, along with its dubbed Telugu version OK Bangaram, and won positive reviews from critics, praising the lead pair's performances and the quality of the film's technical aspects. The film went on to become a financial success at the box office, performing extremely well in multiplexes in India and overseas. The film was later remade into Hindi as OK Jaanu in 2017.
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