Nithyasree Mahadevan (born 25 August 1973), also referred to as S. Nithyashri, is a Carnatic musician and playback singer for film songs in many Indian languages. Nithyashree has performed in all major sabhas in India. She has released more than 500 albums. She is best known for her rendition of the A. R. Rahman composition, "Kannodu Kaanbadhellam" - her playback debut song in the Tamil movie Jeans.
Nithyasree was born to Lalitha Sivakumar and Iswaran. Sivakumar. Her paternal grandmother, D. K. Pattammal, and her grand-uncle, D. K. Jayaraman, were prominent Carnatic vocalists who were established disciples of Ambi Dikshithar, Papanasam Sivan, Koteeswara Iyer, T.L.Venkataramayyar and others. Her maternal grandfather was the mridangam maestro, Palghat Mani Iyer.
Nithyasree first learnt music from her mother, Lalitha Sivakumar. Like her mother, Nithyasree was also the disciple of D. K. Pattammal, and would accompany her in concert. Her father, an accomplished mridangist and disciple of his father-in-law Palghat Mani Iyer, constantly shows his support and accompanies her when she performs. Nithyasree has also been vocally accompanied in some concerts by her niece and disciple, Lavanya Sundararaman.
Nithyasree was married to V. Mahadevan, a mechanical engineer, until his death in 2012. Tanujasree and Tejasree, their two daughters, have also accompanied their mother on stage in concert, and gave their first performance on television during a guest appearance on Airtel Super Singer Junior, a musical talent TV show telecast by Vijay TV.