Ottaplakkal Nambiyadikkal Velu Kurup (Malayalam: ഒറ്റപ്ലാക്കല്‍ നമ്പിയാടിക്കൽ വേലു കുറുപ്പ്), popularly known as O. N. V. Kurup or simply O. N. V., is a Malayalam poet and lyricist from Kerala, India, who won Jnanpith Award,the highest literary award in India for the year 2007. He is considered one of the finest living lyrical poets in India. O. N. V. Kurup is also a lyricist in Malayalam cinema. He received the awards Padma Shri in 1998 and Padma Vibhushan in 2011, the fourth and second highest civilian honours from the Government of India. In 2007 he was bestowed an Honorary Doctorate by University of Kerala, Trivandrum. O. N. V. is known for his leftist leaning. He was the Left Democratic Front (LDF) candidate in the Thiruvananthapuram constituency for the Lok-Sabha elections in 1989.
Kurup was born to O. N. Krishna Kurup and K. Lakshmikutty Amma, on May 27, 1931 at Chavara, Kollam in Kerala.[4] He lost his father when he was eight. His childhood days were spent in the village where he attended the public 'Government School, Chavara'. After graduating with a bachelor's degree in Economics from SN College, Kollam, he moved to Thiruvananthapuram city (Trivandrum) where he joined Travancore University (now Kerala University) and pursued Master of Arts (postgraduate) in Malayalam literature.

O.N.V. was a lecturer at Maharajas College - Ernakulam, University College - Trivandrum, Arts and Science College - Kozhikode, and Brennen College - Thalassery. He joined Government Women's College - Trivandrum as the Head of Malayalam Department. He was also a visiting professor at Calicut University. He retired from service in 1986.

He received the Jnanpith Award, India's highest literary honour, for the year 2007. He is the fifth Jnanpith laureate from Kerala and the second Malayalam poet to win the prestigious award. According to a statement by Bharatiya Jnanpith, the trust which presents the award, Kurup began his career as a "progressive writer and matured into a humanist though he never gave up his commitment to socialist ideology".

He is now settled in Vazhuthacaud in Thiruvanathapuram, with his wife Sarojini, son Rajeev, and daughter Mayadevi.
O. N. V.'s first published poem was 'Munnottu' (Forward) which appeared in a local weekly in 1946. His first poetry collection named Porutunna Soundaryam, came out in 1949. He published a book named Dahikunna Panapatram (The Thirsty Chalice) which was a collection of his early poems during 1946-1956.