Brazzaville (French pronunciation: [bazavil], Kongo: Kintamo, Nkuna, Kintambo, Ntamo, Mavula, Tandala, Mfwa, Mfua, Mfoa; Teke: M'fa, Mfaa, Mfa) is the capital and largest city of the Republic of the Congo (Congo Republic). Constituting the financial and administrative centre of the country, it is located on the north side of the Congo River, opposite Kinshasa, the capital city of the Democratic Republic of the Congo (DR Congo).

The population of the capital is estimated to exceed 1.8 million residents, comprising more than a third of the national populace. Some 40% are employed in non-agricultural professions. During World War II, Brazzaville was also the capital of Free France between 1940 and 1942.

In 2013, Brazzaville was designated a City of Music by UNESCO; since then it has also been a member of the Creative Cities Network.

The Republic of the Congo (pronunciation French: République du Congo, Kituba: Repubilika ya Kôngo), also known as Congo-Brazzaville, the Congo Republic or simply either Congo or the Congo, is a country located in the western coast of Central Africa. The country is bordered to the west by Gabon, to its northwest by Cameroon and its northeast by the Central African Republic, to the southeast by the DR Congo, to its south by the Angolan exclave of Cabinda and to its southwest by the Atlantic Ocean. French is the official language of the Republic of the Congo.

The region was dominated by Bantu-speaking tribes at least 3,000 years ago, who built trade links leading into the Congo River basin. Congo was formerly part of the French colony of Equatorial Africa. The Republic of the Congo was established on 28 November 1958 and gained independence from France in 1960. It was a Marxist–Leninist state from 1969 to 1992, under the name People's Republic of the Congo. The sovereign state has had multi-party elections since 1992, although a democratically elected government was ousted in the 1997 Republic of the Congo Civil War, and President Denis Sassou Nguesso, who first came to power in 1979, has now ruled for over four decades.

The Republic of the Congo is a member of the African Union, the United Nations, La Francophonie, the Economic Community of Central African States, and the Non-Aligned Movement. It has become the fourth-largest oil producer in the Gulf of Guinea, providing the country with a degree of prosperity despite political and economic instability in some areas and unequal distribution of oil revenue nationwide. Congo's economy is heavily dependent on the oil sector, and economic growth has slowed considerably since the post-2015 drop in oil prices. With a population of 5.2 million, 88.5% of the country practices Christianity.