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 Chennai, also known as Madras its official name until 1996, is the capital and largest city of Tamil Nadu, the southernmost state of India. It is located on the Coromandel Coast of the Bay of Bengal. According to the 2011 Indian census, Chennai is the sixth-most-populous city in India and forms the fourth-most-populous urban agglomeration. Incorporated in 1688, the Greater Chennai Corporation is the oldest municipal corporation in India and the second oldest in the world after London.

Historically, the region was part of the Chola, Pandya, Pallava and Vijayanagara kingdoms during various eras. The coastal land which then contained the fishing village Madrasapattinam, was purchased by the British East India Company from the Nayak ruler Chennapa Nayaka in the 17th century. The British garrison established the Madras city and port and built Fort St. George, the first British fortress in India. The city was made the winter capital of the Madras Presidency, a colonial province of the British Raj in the Indian subcontinent. After India gained independence in 1947, Madras continued as the capital city of the Madras State and present-day Tamil Nadu. The city was officially renamed as Chennai in 1996.

The city is coterminous with Chennai district, which together with the adjoining suburbs constitutes the Chennai Metropolitan Area, the 35th-largest urban area in the world by population and one of the largest metropolitan economies of India. Chennai has the fifth-largest urban economy and the third-largest expatriate population in India. Known as the gateway to South India, Chennai is amongst the most-visited Indian cities by international tourists and was ranked 36th among the most-visited cities in the world in 2019 by Euromonitor. Ranked as a beta-level city in the Global Cities Index, it was ranked as the second-safest city in India by National Crime Records Bureau in 2023.

Chennai is a major centre for medical tourism and is termed India's health capital. Chennai houses a major portion of India's automobile industry, hence the name Detroit of India. It was the only South Asian city to be ranked among National Geographic's Top 10 food cities in 2015 and ranked ninth on Lonely Planet's best cosmopolitan cities in the world. In October 2017, Chennai was added to the UNESCO Creative Cities Network UCCN list. It is a major film production centre and home to the Tamil-language film industry.

Etymology

See also: Names of Chennai in different languages

The name Chennai was derived from the name of Chennappa Nayaka, a Nayak ruler who served as a general under Venkata Raya of the Vijayanagara Empire from whom the British East India Company took the town in lease in 1639. The first official use of the name was in August 1639 in a sale deed to Francis Day of the East India Company. A land grant was given to the Chennakesava Perumal Temple in Chennapatanam later in 1646, which some scholars argue to be the first use of the name.

The name Madras is of native origin, and has been shown to have been in use before the British established a presence in India. A Vijayanagara-era inscription found in 2015 was dated to the year 1367 and mentions the port of Mādarasanpattanam, along with other small ports on the east coast, and it was theorized that the aforementioned port is the fishing port of Royapuram. Madras might have been derived from Madraspattinam, a fishing village north of Fort St. George.

In July 1996, the Government of Tamil Nadu officially changed the name from Madras to Chennai. The name Madras continues to be used occasionally for the city as well as for places or things named after the city in the past.