Sunidhi Chauhan (born Nidhi Chauhan on 14 August 1983) is one of the most popular Indian playback singers and performers today, best known for her Hindi film songs in Bollywood. She has also recorded songs in several other Indian dialects and languages, such as; Oriya, Punjabi, Marathi, Kannada, Tamil, Telugu, Malayalam, Bengali, Assamese and Nepali, Urdu and English, making her one of the most recorded voices in India today with over 3000 studio recordings. Sunidhi Chauhan made her International debut with the song Heartbeat (Indian Mix), a collaboration with Enrique Iglesias. She has been awarded with prestigious national awards on several occasions and has established herself as the strongest live performer and singer in India to date. In 2014, Sunidhi Chauhan also made it to the list of Asia's Hottest Women.

As per legendary singer Lata Mangeshkar, Sunidhi is Numero Uno as far as singing is concerned, ahead of her contemporaries - "Sunidhi can sing all kinds of songs. And her voice and style have all the elements that Gen- Now hankers after. Shreya is good, but she is number two. Sunidhi is numero uno."