Zaire (Portuguese: Zaire, French: Zaïre, Kongo: Nzadi) is one of the 18 provinces of Angola. It occupies 40,130 square kilometres (15,490 sq mi) in the north west of the country and had a population of 594,428 inhabitants in 2014. It is bordered on the west by the Atlantic Ocean, on the north by the Democratic Republic of Congo, on the east by the Uíge Province, and on the south by the Bengo Province.

The Kongo people (or Bakongo) occupied the valley of the Congo (or Zaire) River in the mid-thirteenth century, and formed the Kingdom of Kongo, which existed from 1390 until 1891 as an independent state, and until 1914 as a vassal state of the Kingdom of Portugal. In 1914, the Kongo monarchy was abolished after Portuguese suppression of several revolts. From 1885, Portuguese Angola included the District of Congo, which was split in 1919 into the districts of Cabinda and Zaire, respectively north and south of the Congo/Zaire River.

During the 1961–1974 Angolan War of Independence, a large fraction of the Bakongo fled to the Republic of Zaire. Many of these refugees and their offspring returned after the Alvor Agreement recognised Angolan independence.

Historical and cultural monuments include:

M'Banza Congo (formerly São Salvador do Congo) is the provincial capital. The city is located around 481 kilometres (299 mi) of Luanda and 314 kilometres (195 mi) of Uíge.

The province of Zaire contains six municipalities (Portuguese: municípios):

The province of Zaire contains the following communes (Portuguese: comunas), sorted by their respective municipalities:

Zaire Province has two seasons: from November to May, the rainy season; and from June to October, the dry season. The predominant types of weather in the province are tropical wet climate and semi-arid. The temperature in the area varies between 24 °C and 26 °C.