Tân An is the capital city of Long An Province in Mekong Delta region of Vietnam. It was upgraded from town status to city status on 26 August 2009. The population of Tân An is 165,214 as of 2009, with an area of 81.79 km². It comprises nine wards (1, 2, 3, 4, 5, 6, 7, Khánh Hậu and Tân Khánh), and five communes (An Vĩnh Ngãi, Bình Tâm, Hướng Thọ Phú, Lợi Bình Nhơn and Nhơn Thạnh Trung).

Tân An is in the south-west of Ho Chi Minh City, 47 km away from the city centre and bordered to the north by Thủ Thừa District, to the east by Tân Trụ District and Châu Thành District and to the west and south-west by Tiền Giang Province. Ward 1 is the economic, political and cultural center of the city.

Tân An is the political, cultural, economic, scientific and technological center of Long An province. The township is in the development of the Southern Key Economic Region, and the economic gateway to the provinces of the Mekong River Delta, with the main river and road traffic, National Highway 1A, National Highway 62 and Vàm Cỏ Tây river, flowing through the center.