Maria Eleonora of Brandenburg (11 November 1599 – 28 March 1655) was a German princess and queen consort of Sweden. She was the daughter of John Sigismund, Elector of Brandenburg and Anna, Duchess of Prussia, daughter of Albert Frederick, Duke of Prussia. In the year 1620 Maria Eleonora married, with her mother's consent but against her brother's will, the Swedish king Gustavus Adolphus. She bore a daughter, Christina, in 1626. She was described as the most beautiful queen in Europe, and, as her daughter later said, had "all the virtues and vices" associated with her gender.