P. Unnikrishnan is a Carnatic vocalist and a national award winning playback singer. Unnikrishnan was born to K.Radhakrishnan and Dr.Harini Radhakrishnan, in Kerala.He went to Asan Memorial Senior Secondary School, Chennai, in 1983. He graduated from Vivekananda College, Chennai, and received his B.Com degree from the Madras University. He earned a General Law and Post Graduate Diploma in Personnel Management and Industrial Relations.He worked as an executive in Parrys Confectionery Ltd. from 1991-94 and left to become a professional singer.
Unnikrishnan was initiated into Carnatic Music at age of 12 by Seshadri, Unnikrishnan. He was inspired by Sangita Kalanidhi Dr. S. Ramanathan. He attended a special workshop for six months on Veena Dhanammal Bhani under Sangeetha Kalanidhi T.Brinda and Sangeetha Kalanidhi Dr.T.Vishwanathan.
He is a national award winning playback singer. He is one of the permanent judges in the reality television show Airtel Super Singer on Vijay TV in both the seasons(2006