South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. Its nine provinces are bounded to the south by 2,798 kilometres (1,739 miles) of coastline that stretches along the South Atlantic and Indian Ocean; to the north by the neighbouring countries of Namibia, Botswana, and Zimbabwe; to the east and northeast by Mozambique and Eswatini; and it encloses Lesotho. Covering an area of 1,221,037 square kilometres (471,445 square miles), the country has over 62 million people. Pretoria is the administrative capital, while Cape Town, as the seat of Parliament, is the legislative capital. Bloemfontein has traditionally been regarded as the judicial capital. The largest and most populous city is Johannesburg, followed by Cape Town and the busiest port city in sub-Saharan Africa, Durban.

Archaeological findings suggest that various hominid species existed in South Africa about 2.5 million years ago, and modern humans inhabited the region over 100,000 years ago. The first known people were the indigenous Khoisan, and Bantu-speaking peoples who expanded from West and Central Africa later settled in the region 2,000 to 1,000 years ago. In the north, the Kingdom of Mapungubwe formed in the 13th century. In 1652, the Dutch established the first European settlement at Table Bay, and in 1795 and 1806, the British occupied it. The Mfecane, a period of significant upheaval, led to the formation of various African kingdoms, including the Zulu Kingdom. The region was further colonised, and diamonds and gold were discovered, bringing a shift towards industrialisation and urbanisation. The Union of South Africa was created in 1910 out of the former Cape, Natal, Transvaal, and Orange River colonies, becoming a republic in 1961. Though a system of non-racial franchise had existed in the Cape, it was gradually eroded, and the vast majority of Black South Africans were not enfranchised until 1994.

The National Party imposed apartheid in 1948, institutionalising previous racial segregation. After a largely non-violent struggle by the African National Congress and other anti-apartheid activists both inside and outside the country, the repeal of discriminatory laws began in the mid-1980s. Universal elections took place in 1994, following which all racial groups have held political representation in the country's liberal democracy, which comprises a parliamentary republic and nine provinces.

South Africa is a multi-ethnic society encompassing a wide variety of cultures, languages, and religions; it is often referred to as the "rainbow nation" to describe the country's multicultural diversity, especially in the wake of apartheid. Recognised as a middle power in international affairs, it maintains significant regional influence and is a member of BRICS, the African Union, SADC, SACU, the Commonwealth of Nations, and the G20. A developing, newly industrialised country, South Africa has the largest economy in Africa by nominal GDP. It is tied with Ethiopia for the most UNESCO World Heritage Sites in Africa, and is a biodiversity hotspot with unique biomes, plant, and animal life. Since the end of apartheid, government accountability and quality of life have substantially improved. However, crime, poverty, and inequality remain widespread. Having the highest Gini coefficient of 0.63, South Africa is considered one of the most unequal countries in the world, if not the most unequal.