O Kadhal Kanmani is the soundtrack album, composed by A. R. Rahman, to the 2015 Indian Tamil film of the same name written and directed by Mani Ratnam. The soundtrack album consists of nine tracks each in original Tamil and Telugu version of the albums with one track "Maula Wa Sallim" being common to both. Majority of the tracks for the original version were penned by Vairamuthu. The lyrics to the Telugu version were written by Sirivennela Sitaramasastri.The lyrics to its Hindi version songs in its Hindi remake OK Jaanu is by Gulzar The songs are fusion of contemporary music with carnatic music as well as pure classical Indian music based songs in the genres—carnatic and Hindustani. The original score was produced by ensemble Qutb-e-Kripa along with Rahman. The score utilises the songs and re-performed carnatic compositions of musicians Tyagaraja and Annamacharya.

The male version of "Mental Manadhil" was the released as the first single from the soundtrack album. The music was released on April 4, 2015 by Sony Music India. Upon release, the soundtrack album garnered positive reviews from the music critics who praised the fusion of classical and contemporary genres, sync of songs with film narration and the production quality.

The soundtrack album was awarded as the "Best Tamil Album of the Year" in 2015 by Apple Music.

It’s an extension of love. I have got everything in my life, working with Mani Ratnam and Roja (1992 film). I am still committed...OK Kanmani is a very young album. It’s got very traditional kind of songs.

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