Dhivagar Santhosh (also known as Diwakar) is an Indian playback singer and live performer. He is best known for winning season 4 of Airtel Super Singer, a Tamil language musical reality TV show which was telecast from December 2012 to February 2014 on Vijay TV.
Diwakar participated in various reality TV musical competitions telecast on various Tamil language TV channels, including Zee Tamil's Sa Re Ga Ma Pa 2009 Challenge, Jaya TV's Hariyudan Naan, and season 2 of Sun TV's Sangeetha Mahayuddham. In 2012, Diwakar was crowned runner up in Raj TV's Voice of Tamil Nadu.
On 1 February 2014, he was crowned the winner of season 4 of the Airtel Super Singer music competition telecast on Vijay TV, having received the greatest number of viewer votes. During the show's grand finale, Diwakar's performance of the song "Neeye Unakku Endrum" from the film Bale Pandiya prompted a standing ovation from the audience and a kiss on his forehead from playback singer, S. Janaki.