Hariharan (born 3 April 1955) is an Indian playback, bhajan and ghazal singer from Trivandrum, whose songs have been featured mainly in Tamil and Hindi. Also he sang notable songs in Telugu, Malayalam, Kannada, Marathi and Bhojpuri films. He is an established ghazal singer and one of the pioneers of Indian fusion music. In 2004, he was honoured with the Padma Shri by the Government of India and is a two-time National Award winner. He is regarded as one of the greatest Indian singers of all time.

Hariharan, associating with Lesle Lewis, formed Colonial Cousins, a two-member band. They have cut many private music albums and also scored music for few feature films in Tamil cinema and Bollywood cinema.

On May 28, 2020, Hariharan and Late Gulshan Kumar’s Hanuman Chalisa recorded under the label of T-Series crossed 1-billion views mark on YouTube – making it the first devotional song in the world to do so.