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Aliens registration card with 'naturalised' written across it (Catalogue reference: MEPO 35/1/4)

This is a brief guide to finding records of a naturalised Briton. It is intended to help you find information about somebody who came to Britain in the past.

For information on how to obtain a copy of a certificate of British nationality between 1 January 1949 and 30 September 1986 or a naturalisation issued between 1 January 1981 and 1 January 1986 please use our online form on certificates of British citizenship instead.

 

  • What records can I find at The National Archives at Kew?

    • Naturalisation case papers (1789-1934)

      Search the Catalogue (HO 1, HO 45 and HO 144) by last name (surname) and nat* for naturalisation case papers.

    • Naturalisation case papers (1934-c.1968)

      Search the Catalogue (HO 405) by last name for naturalisation case papers.

      Files may also contain later correspondence, mostly until the mid-1960s but some as late as 1996.

      HO 405 only contains names beginning with the letters A-N. Those for surnames starting O-Z are still held by the Home Office. The documents are subject to 100 year closure (although access can be requested under the Freedom of Information Act) and only about 40% of applications in this seriesa grouping of records held by The National Archives, based on common function or subject have survived.

    • Duplicate certificates of naturalisation issued in the UK (1870-1980) and issued overseas (1915-1982)

      Search the catalogue (HO 334, HO 409) by first and last name for duplicate certificates of naturalisation and indexes to naturalisation.

  • What records can I find in other archives and organisations?

    • Huguenot Society records

      Consult the Huguenot Society website, which includes information about their archives and details of publications to help you trace individual immigrants, including indexes of naturalisations by private Act of Parliament up to 1800.

  • What other resources will help me find information?

    • Websites

      Search Parliamentary papers (institutional subscription required) for indexes of all naturalisations from 1844 to 1961.

    • Books

      Read Migration Records by Roger Kershaw (The National Archives, 2009).

  • The National Archives is not responsible for the content of external websites.

Related guides

Did you know?

If immigrants came to Britain from Ireland or the British colonies they were called Britons. If they came from elsewhere (including Scotland before 1707) they were called aliensalien - a person who is not a citizen of the country they are living in.

Foreigners wishing to become English (or later, British) could either apply for denizationthe granting of residence in a country and certain rights of citizenship, such as the protection of the law (which made them almost equivalent to native-born Britons and granted them most of a free subject's rights and the protection of the law) or naturalisationto make someone a legal citizen of a country they were not born in (which granted them all the rights and made them a subject of the Crown). However, most foreign settlers did not bother to go through these formalities and so do not appear in these records.

Before the mid-20th century Britons from across the world were British citizens. After the British Nationality Act 1948, colonial Britons had to register British citizenship.

There is more information in the background papers to the applications than on the certificates themselves. Many are name searchable in the Catalogue.

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