Grand Duchess Marie Anne (Portuguese: Maria Ana; 13 July 1861 – 31 July 1942) was a Portuguese Princess, Grand Duchess consort of Luxembourg and its Regent. She was a member of the House of Braganza.

Born at Schloss Bronnbach in Bronnbach, Wertheim am Main, Kingdom of Württemberg, Infanta Marie Anne (or Maria Ana) was the fifth child and second-youngest daughter of deposed usurper Miguel of Portugal and his wife Princess Adelaide of Löwenstein-Wertheim-Rosenberg. As such, she was titled and styled from birth as an Princess of Portugal. At the time of her birth, her father had been exiled, and the family lived as guests in the Austro-Hungarian Empire.

In spite of their straitened circumstances, the daughters of Miguel I made good marriages, some to reigning monarchs and deposed heads of Roman Catholic European dynasties.

Before her marriage with William IV, Grand Duke of Luxembourg she was considered by Emperor Franz Joseph I of Austria as a suitable bride to his only son and heir, Rudolf, Crown Prince of Austria but Rudolf did not like her and she would remain single for the next years. Infanta Maria Ana was married on 21 June 1893 at Schloss Fischhorn, Zell am See, to the Protestant William, Hereditary Grand Duke of Luxembourg, the eldest child and heir apparent of Adolphe, Grand Duke of Luxembourg, head of the House of Nassau. It was agreed that the children would be raised in their mother's Catholic faith, the religion of the overwhelming majority of Luxembourg's population.

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