Princess Marie of Saxe-Altenburg, VA (Alexandrina Mary Wilhelmina Catherine Charlotte Theresa Henrietta Louise Pauline Elizabeth Frederica Georgina; German: Alexandrine Marie Wilhelmine Katharine Charlotte Theresia Henriette Luise Pauline Elisabeth Friederike Georgine; 14 April 1818 – 9 January 1907) was Queen of Hanover and the consort of George V, a grandson of George III of the United Kingdom and Queen Charlotte.

Marie was born at Hildburghausen, as Princess Marie of Saxe-Hildburghausen, the eldest daughter of Joseph, the Hereditary Prince of Saxe-Hildburghausen and Duchess Amelia of Württemberg. In 1826, the family moved to Altenburg as a result of a transfer of territories among the various branches of the Ernestine Wettins, and Marie took the title Princess of Saxe-Altenburg in place of the previous.

Marie married, on 18 February 1843, at Hanover, George, The Crown Prince of Hanover. They had three children - Prince Ernest Augustus, Princess Frederica, and Princess Marie.

The Crown Prince and Princess became King and Queen of Hanover upon the death of his father, Ernest Augustus I of Hanover, on 18 November 1851. Her husband was expelled from his kingdom in 1866 as a result of his support for Austria in the Austro-Prussian War, and on 20 September 1866, the Kingdom was annexed by Prussia. Nevertheless, George never abdicated; he, Marie and their children lived in exile at Gmunden, in Austria, until George's death in 1878.

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