Panjin (simplified Chinese: 盘锦; traditional Chinese: 盤錦; pinyin: Pánjǐn) is a coastal prefecture-level city in central Liaoning province, People's Republic of China, situated on the northern shore of the Liaodong Bay.

It is the smallest city in both Liaoning and the entire Northeast China with an administrative area of 3,825 square kilometres (1,477 sq mi), and Liaoning's least populous city with a population of 1,389,691 people as of the 2020 census, all in the built-up (or metro) area made of the 2 urban districts and Dawa and Panshan counties now largely being conurbated.

Panjin was established as a prefecture-level city with its current boundaries by the State Council on June 5, 1984.

Panjin is located between 40°40'−41°27' N and 121°31'−122°28' E, with its urban section mainly on the historical Liao River Delta.

The Shuangtaizi River (which gives name to the city's Shuangtaizi District), formally the smaller western distributary but now the only lower section of the Liao River system, flows through the city and drains into the Liaodong Bay to its west between its Dawa District and Panshan County.