The British passport is a travel document issued by the United Kingdom or other British dependencies and territories to individuals holding any form of British nationality. It grants the bearer international passage in accordance with visa requirements and serves as proof of UK citizenship. It also facilitates access to consular assistance from British embassies around the world. Passports are issued using royal prerogative, which is exercised by His Majesty’s Government; this means that the grant of a passport is a privilege, not a right, and may be withdrawn in some circumstances. British citizen passports have been issued in the UK by His Majesty’s Passport Office, an agency of the Home Office, since 2014. All passports issued in the UK since 2006 have been biometric.

The legacy of the United Kingdom as an imperial power has resulted in several types of British nationality, and different types of British passport exist as a result. Furthermore, each of the Crown dependencies and certain Overseas territories issue their own variants of British passports to those with links to their jurisdictions, which have small differences from the UK-variant passport. All British passports enable the bearer to request consular assistance from British embassies and from certain Commonwealth high commissions in some cases. British citizens can use their passport as evidence of right of abode in the United Kingdom.