Krishnakumar Kunnath (23 August 1968 – 31 May 2022), popularly known as KK, was an Indian playback singer. He recorded songs primarily in Hindi, Tamil, Telugu and Kannada. Noted for his versatility in a variety of music genres, KK is regarded as one of the greatest playback singers of India of all time. He was a recipient of two Screen Awards, along with nominations for six Filmfare Awards.

KK began his career by singing advertising jingles and made his film debut in 1996 with a song in Maachis. KK released his debut album, Pal in 1999. The songs "Pal" and "Yaaron" from the album became popular, and are used in school graduations. The album turned out to be his career breakthrough. The song "Tadap Tadap Ke" from the 1999 film Hum Dil De Chuke Sanam, earned him his first Filmfare Award for Best Male Playback Singer nomination.

KK went onto establish himself as one of the leading singers of the 2000s with successful songs in various languages. His most popular songs include — "Koi Kahe Kehta Rahe" from Dil Chahta Hai (2001), "O Humdum Suniyo Re" from Saathiya (2002), "Dola Re Dola" from Devdas (2002), "Uyirin Uyirae" from Kaaka Kaaka (2003), "Apadi Podu" from Ghilli (2004), "Dus Bahane" from Dus (2005), "Kya Mujhe Pyaar Hai" from Woh Lamhe... (2006), "Tu Hi Meri Shab Hai" from Gangster: A Love Story (2006), "Aankhon Mein Teri" from Om Shanti Om (2007), "Khuda Jane" from Bachna Ae Haseeno (2008), "Zara Sa" from Jannat (2008), "Sajde" from Khatta Meetha (2010), "Piya Aaye Na" from Aashiqui 2 (2013), "Mat Aazma Re" from Murder 3 (2013), "India Wale" from Happy New Year (2014), and "Tu Jo Mila" from Bajrangi Bhaijaan (2015).

KK was popularly known as "The Mesmerizer", for his romantic songs. KK received the Screen Awards for Best Singer – Male (non-film music) for his song "Pal" and Best Playback Singer – Male for "Khuda Jaane", from the film Bachna Ae Haseeno.