Kinshasa (; French: [kinʃasa]; Lingala: Kinsásá), formerly Léopoldville, is the capital and largest city of the Democratic Republic of the Congo. Once a site of fishing and trading villages situated along the Congo River, Kinshasa is now one of the world's fastest growing megacities.

The city of Kinshasa is also one of the DRC's 26 provinces. Because the administrative boundaries of the city-province cover a vast area, over 90 percent of the city-province's land is rural in nature, and the urban area occupies a small but expanding section on the western side.

Kinshasa is Africa's third-largest metropolitan area after Cairo and Lagos. It is also the world's largest nominally Francophone urban area, with French being the language of government, education, media, public services and high-end commerce in the city, while Lingala is used as a lingua franca in the street. Kinshasa hosted the 14th Francophonie Summit in October 2012.

Residents of Kinshasa are known as Kinois (in French and sometimes in English) or Kinshasans (English). The indigenous people of the area include the Humbu and Teke. The city faces Brazzaville, the capital of the neighbouring Republic of the Congo. Although the river span is 7 km wide at this point, the two cities are the world's second-closest pair of capital cities (after Vatican City and Rome).