O Kadhal Kanmani (transl. Oh love, apple of my eye), also known as OK Kanmani, is a 2015 Indian Tamil-language romantic comedy film written, directed and produced by Mani Ratnam. The film stars Dulquer Salmaan and Nithya Menen, 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.