Maria Anna of Austria (Maria Anna Josepha; 7 September 1683 – 14 August 1754) was an Archduchess of Austria as she was a daughter of Leopold I, Holy Roman Emperor. She would become Queen consort and regent of Portugal by her marriage to John V of Portugal. She was the Regent of Portugal from 1742 until 1750 during the illness of her spouse. In Portugal she was commonly known as "Mariana". 