Marie Anna of Saxony, Grand Duchess of Tuscany (15 November 1799 – 24 March 1832), (full name: Maria Anna Carolina Josepha Vincentia Xaveria Nepomucena Franziska de Paula Franziska de Chantal Johanna Antonia Elisabeth Cunigunde Gertrud Leopoldina), was a princess of Saxony.
She became Grand Duchess of Tuscany by her marriage to Leopold II, Grand Duke of Tuscany.