Mahathi (Tamil: மஹதி) is a Carnatic musician and playback singer for film songs in several Indian languages.

Mahathi was born in Chennai to a family of Carnatic musicians. Her maternal great grandfather, Pazhamaneri Swaminatha Iyer, was a Carnatic vocalist and recipient of the Sangeetha Kalanidhi title. Her mother, Vasanthi Sekhar, was a flautist, while her father, Thiruvaiyaru Sekar was a Carnatic vocalist and disciple of M. Balamuralikrishna.

Mahathi moved to Kerala as a toddler, and did her schooling Hari Sri Vidya Nidhi, Trichur and Sacred Heart Convent, Cochin. She graduated in Chennai from Meenakshi College, Kodambakkam with English literature as her main stream.

Mahathi was married on 16 March 2008 to Dr. K. Sreekumar, an oral and maxillo facial surgeon. Their son, Samarth, was born on 27 February 2011.