Elizabeth II is Queen of the United Kingdom and has been since 1952.
Current reigning monarchs by length of reign . Elizabeth II is the current longest-reigning monarch , having been Queen of the United Kingdom , Canada , Australia and New Zealand since 6 February 1952 . Elizabeth II ( Elizabeth Alexandra Mary ; born 21 April 1926 ) has been Queen of the United Kingdom , Canada , Australia , and New Zealand since 6 February 1952 . In October 2016 , she became the longest currently reigning monarch and head of state following the death of King Bhumibol Adulyadej of Thailand . This is a list of British monarchs by longevity since the Union of the Crowns of England , Scotland and Ireland in 1603 . Queen Elizabeth II , the present British monarch ( born 21 April 1926 ; Queen since 6 February 1952 ) , is the longest lived British sovereign , at the age of .