Thiruvananthapuram District is the southernmost district of the coastal state of Kerala. It is the largest city in Kerala. It came into existence in the year 1957. The headquarters is the city of Thiruvananthapuram (Trivandrum) which is also the capital city of Kerala. The district has an area of 2,192 square kilometres (846 sq mi) and a population of 3,307,284 (as per the 2011 census), the second-most populous district in Kerala after Malappuram district.

It is the densest district in Kerala with 1,509 inhabitants per square kilometre (3,910/sq mi). It is divided into six taluks: Thiruvananthapuram, Chirayinkeezhu, Neyyattinkara, Nedumangadu, Varkala and Kattakada. The urban bodies in the district are the Thiruvananthapuram Corporation, Varkala, Neyyattinkara, Attingal and Nedumangad municipalities.