A British Overseas citizen (BOC) is a holder of a residual class of British nationality, largely held by people connected with former British colonies who do not have close ties to the United Kingdom or its remaining overseas territories. Individuals with this form of nationality are British nationals and Commonwealth citizens, but not British citizens. BOCs are subject to immigration control when entering the United Kingdom and do not have the automatic right of abode there or in any British overseas territory.

This nationality gives its holders a limited set of rights when they are resident in the United Kingdom, conferring eligibility to vote, to obtain citizenship under a simplified process, and to serve in public office or non-reserved government positions. About 10,000 BOCs currently hold active British passports with this status and enjoy consular protection when travelling abroad. However, BOCs who do not have the right to live in the UK nor the overseas territories and have no other citizenship are de facto stateless as they are not guaranteed the right to enter the country of which they are nationals.