The British Central Africa Protectorate (BCA) was a British protectorate proclaimed in 1889 and ratified in 1891 that occupied the same area as present-day Malawi: it was renamed Nyasaland in 1907. British interest in the area arose from visits made by David Livingstone from 1858 onward during his exploration of the Zambezi area. This encouraged missionary activity that started in the 1860s, undertaken by the Universities' Mission to Central Africa, the Church of Scotland and the Free Church of Scotland, and which was followed by a small number of settlers. The Portuguese government attempted to claim much of the area in which the missionaries and settlers operated, but this was disputed by the British government. To forestall a Portuguese expedition claiming effective occupation, a protectorate was proclaimed, first over the south of this area, then over the whole of it in 1889. After negotiations with the Portuguese and German governments on its boundaries, the protectorate was formally ratified by the British government in May 1891.

A protectorate, in the context of international relations, is a state that is under protection by another state for defence against aggression and other violations of law. It is a dependent territory that enjoys autonomy over most of its internal affairs, while still recognizing the suzerainty of a more powerful sovereign state without being a possession. In exchange, the protectorate usually accepts specified obligations depending on the terms of their arrangement. Usually protectorates are established de jure by a treaty. Under certain conditions—as with Egypt under British rule (1882–1914)—a state can also be labelled as a de facto protectorate or a veiled protectorate.