Omkar Prasad Nayyar (16 January 1926 – 28 January 2007) was an Indian film music composer, singer-songwriter, music producer, and musician. He is considered to be one of the most rhythmic and melodious music directors of the Hindi film industry. He won the 1958 Filmfare Award for Best Music Director for Naya Daur. Nayyar worked extensively with singers Geeta Dutt, Asha Bhosle, Mohammed Rafi, though not with leading Bollywood female singer Lata Mangeshkar.

O. P. Nayyar had recognised Kishore Kumar long before he became a popular singer. The film like Baap Re Baap (1955) is one of Kishore Kumar hits in the characteristic "O. P." style as well as the film Raagini (1958), but the relationship did not endure.