Black British is a term used to describe British people of black African descent, especially those of Afro-Caribbean background. The term has been used from the 1950s to refer to Black people from former British colonies in the West Indies (i.e. the New Commonwealth) and Africa, who are residents of the United Kingdom and consider themselves British. Others are also from former French-speaking colonies in Africa such as Senegal and the Democratic Republic of the Congo (which was Belgian), and many of the Black Africans in Britain still speak French as well as their own native languages.

The term 'black' has historically had a number of applications as a racial and political label, and may be used in a wider socio-political context, to encompass a broader range of non-European ethnic minority populations in Britain, though this is a controversial and non-standard definition.

Black British is primarily used as an official category in UK national statistics ethnicity classifications, where it is sub-divided into 'Caribbean', 'African' and 'Other Black' groups.

The term black people is used in some socially-based systems of racial classification for humans of a dark-skinned phenotype, relative to other racial groups represented in a particular social context. Different societies apply different criteria regarding who is classified as "black", and often social variables such as class and socio-economic status also play a role, so that relatively dark-skinned people can be classified as white if they fulfill other social criteria of "whiteness" and relatively light-skinned people can be classified as black if they fulfill the social criteria for "blackness" in a particular setting.

As a biological phenotype being "black" is often associated with the very dark skin colors of some people who are classified as "black". But, particularly in the United States, the racial or ethnic classification also refers to people with all possible kinds of skin pigmentation from the darkest through to the very lightest skin colors, including albinos, if they are believed by others to have African ancestry, or to exhibit cultural traits associated with being "African-American". As a result, in the United States the term "black people" is not an indicator of skin color but of socially based racial classification.