Countess Maria Antoinetta Josefa Johanna Baptista of Waldstein-Wartenberg (Vienna, 29/31 March 1771 – Vienna, 17 January 1854) was a Bohemian noble and maternal grandmother of Ferdinand II of Portugal.
She was a fourth child of Count George Christian of Waldstein-Wartenberg and of his wife Elisabeth (descendant of the notorious Corfitz Ulfeldt). In Vienna on 13 February 1792, she married Hungarian nobleman Ferencz József Koháry de Csábrág, to whom she bore two children, Ferenc (21 December 1792 – 19 April 1795) and Maria Antonia Koháry de Csábrág.
