Gudalur Narayanaswamy Balasubramaniam (6 January 1910 – 1 May 1965), popularly known as GNB, was an Indian Carnatic singer. He innovated the art through emphasis on laya control and reducing the gamakas which eventually made Carnatic music appeal to the lay and the learned alike. He was also a Tamil film actor.Ariyakudi Iyengar inspired him.

He was born in Gudalur, a small Tamil Nadu village, which is close to Mayavaram. He was the son of G V Narayanaswamy Iyer, who was a music student. Throughout his younger years, he closely observed the techniques of the musicians of his day. Ariyakudi Ramanuja Iyengar became his manasika guru and inspiration. While his father hoped that GNB would become a successful lawyer, he was intent on pursuing his musical ambitions. He completed his BA (Hons) in English Literature at the Christian College, Chennai, and took up a short music course at Annamalai University. under the guidance of T S Sabesa Iyer, but discontinued due to ill health. However, he joined the diploma course in music under Madras University in the first batch and Tiger Varadhachariar was the principal. Within 2 years, he was ready for concert performances. He gave his first concert in 1928.