British people (also referred to as the British, Britons, or informally as Brits or Britishers) are citizens or natives of the United Kingdom, of the Isle of Man, of any of the Channel Islands, or of any of the British overseas territories, and their descendants.British nationality law governs modern British citizenship and nationality, which can be acquired, for instance, by birth in the UK or by descent from British nationals. When used in a historical context, the term British people refers to the ancient Britons, the indigenous inhabitants of Great Britain south of the Forth.

Although early assertions of being British date from the Late Middle Ages, the creation of the Kingdom of Great Britain in 1707 triggered a sense of British national identity. The notion of Britishness was forged during the Napoleonic Wars between Britain and the First French Empire, and developed further during the Victorian era. The complex history of the formation of the United Kingdom created a "particular sense of nationhood and belonging" in Great Britain; Britishness became "superimposed on much older identities", of English, Scots and Welsh cultures, whose distinctiveness still resist notions of a homogenised British identity. Because of longstanding ethno-sectarian divisions, British identity in Northern Ireland is controversial, but it is held with strong conviction by unionists.

The English (from Old English: Englisc) are a nation and ethnic group native to England, who speak English. The English identity is of early mediaeval origin, when they were known in Old English as the Anglecynn. England is now a country of the United Kingdom, and the majority of English people in England are British Citizens. Their ethnonym is derived from the Angles, a Germanic people originally from Northern Germany who migrated to Britain.

Historically, the English population is descended from several genetically similar peoples—the earlier Britons (or Brythons), the Germanic tribes that settled in the area, including Angles, Saxons, and Jutes, collectively known as the Anglo-Saxons, who founded what was to become England (from the Old English Englaland), and the later Danes, Normans and other groups. Following the Act of Union in 1707, in which the Kingdom of England became part of the Kingdom of Great Britain, English customs and identity became closely aligned with British customs and identity.