| Countess Maria Antonia von Waldstein | |
| Native Name Lang: | de |
| Birth Name: | Maria Antonie Gräfin von Waldstein Herrin zu Wartenberg |
| Birth Date: | 4 March 1771 |
| Birth Place: | Vienna, Archduchy of Austria, Holy Roman Empire |
| Death Place: | Vienna, Austrian Empire, Habsburg monarchy |
| Countess von Waldstein Princess Koháry de Csábrág et Szitnya | |
| Spouse: | Ferenc József, Prince Koháry de Csábrág et Szitnya |
| Children: | Ferenc (1792–1795) Mária Antónia (1797–1862) |
| Parents: | Count Georg Christian von Waldstein Countess Elisabeth Ulfeldt |
Countess Maria Antonie Gräfin von Waldstein Herrin zu Wartenberg (4 March 1771, Vienna – 17 January 1854, Vienna) was a Bohemian noblewoman.[1] By birth, she was a member of the prominent House of Waldstein, maternal grandmother of King Ferdinand II of Portugal and great-grandmother of King Ferdinand I of Bulgaria.
Born into an old House of Waldstein, Antonia was the fourth child of Count Georg Christian von Waldstein (1743–1791) and wife, Countess Elisabeth Ulfeldt (1747–1791), and is the great-granddaughter of the notorious Count Corfitz Ulfeldt. In Vienna on 13 February 1792, Antonia married the Hungarian nobleman Ferenc József, Prince Koháry de Csábrág et Szitnya, a member of the enormously affluent House of Koháry, to whom she bore two children; Ferenc (1792–1795) and Mária Antónia (1797–1862) who married the German Prince Ferdinand of Saxe-Coburg and Gotha and bore four children.