Karaikudi is a city in Sivaganga district in the Indian state of Tamil Nadu. It is part of the area commonly referred to as "Chettinad". Karaikudi is declared a heritage town by the Government of Tamil Nadu, on account of the palatial houses built with limestone called karai veedu.
Karaikudi comes under the Karaikudi assembly constituency which elects a member to the Tamil Nadu Legislative Assembly once every five years and it is a part of the Sivaganga (Lok Sabha constituency) which elects its Member of Parliament (MP) once in five years. The city is administered by the Karaikudi municipality, which covers an area of . As of 2001, the town had a population of 86,596. Cauvery delta region, but salt extraction and prawn cultivation are the major occupations. Roadways are the major mode of transportation to Karaikudi and the nearest airport is Madurai Airport, located away from the town.