Tirunelveli, also known as Nellai and historically as Tinnevelly, is a major city in the Indian state of Tamil Nadu. It is the administrative headquarters of the Tirunelveli District. It is the fourth-largest municipal corporation in the state after Chennai, Coimbatore, and Madurai. Tirunelveli is located 624 km (388 mi) southwest of the state capital Chennai, 58 km (36 mi) away from Thoothukudi, and 73 km (45 mi) from Kanyakumari. The downtown is located on the west bank of the Thamirabarani River; its twin Palayamkottai is on the east bank. Palayamkottai is called the Oxford of South India as it has many schools and colleges. It has several important government offices.

Tirunelveli district is one of the 38 districts of Tamil Nadu state in India. It is the largest district in terms of area with Tirunelveli as its headquarters. The district was formed on 1 September 1790 by the British East India Company, and comprised the present Tirunelveli and Thoothukudi, Tenkasi and parts of Virudhunagar and Ramanathapuram district. As of 2011, the undivided district had a population of 3,077,233.