Abbreviation for The National Archives, this being the official government archives of England, Wales and the United Kingdom. It is based in Kew on the outskirts of London.

Much material held there can be searched by the Discovery Catalogue (though note this now by default also includes catalogues to many other archives around the UK; you must filter to only see what is available at Kew).

Website: www.nationalarchives.gov.uk

For more about what can be found at TNA and what on this website was researched there see the glossary entry for The National Archives.