Vellore, also natively spelt as Velur, is a sprawling city and the administrative headquarters of Vellore district in the Indian state of Tamil Nadu. It is located on the banks of the Palar River in the northeastern part of Tamil Nadu and is separated into four zones that are further subdivided into 60 wards, covering an area of 87.915 km2 and housing a population of 423,425 as reported by the 2001 census. It is located about 137.20 kilometres (85 mi) west of Chennai, and about 213.20 kilometres (132 mi) east of Bangalore. Vellore is located on the Mumbai–Chennai arm of the Golden Quadrilateral. Vellore is governed under a mayor and the Vellore Municipal Corporation. It is a part of both the Lok Sabha and state assembly constituencies of Vellore.

Vellore district is one of the 38 districts in the Tamil Nadu state of India. It is one of the eleven districts that form the north region of Tamil Nadu. Vellore city is the headquarters of this district. As of 2011, the district had a population of 1,614,242 with a sex ratio of 1,007 females for every 1,000 males. In 2017 Vellore district ranked eleventh in list of districts in Tamil Nadu by Human Development Index.