| Princess Antoinette of Saxe-Coburg-Saalfeld | |||||
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| Born | 28 August 1779 Coburg, Saxe-Coburg-Saalfeld | ||||
| Died | 14 March 1824 (aged 44) Saint Petersburg, Russian Empire | ||||
| Spouse | Duke Alexander of Württemberg | ||||
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| House | House of Wettin (by birth) House of Württemberg (by marriage) | ||||
| Father | Francis, Duke of Saxe-Coburg-Saalfeld | ||||
| Mother | Countess Augusta of Reuss-Ebersdorf | ||||
Princess Antoinette Ernestine Amalie of Saxe-Coburg-Saalfeld (28 August 1779 – 14 March 1824) was a German princess of the House of Wettin. By marriage, she was a Duchess of Württemberg. Through her eldest surviving son, she is the ancestress of today's (Catholic) House of Württemberg.
Born in Coburg, Antoinette was the second daughter of Francis, Duke of Saxe-Coburg-Saalfeld, and Countess Augusta Reuss of Ebersdorf. She was also the elder sister of King Leopold I of Belgium and the aunt of both Queen Victoria and her husband, Prince Albert. Her maternal grandparents were Heinrich XXIV, Count Reuss of Ebersdorf, and Countess Karoline Ernestine of Erbach-Schönberg, and her paternal grandparents were Ernest Frederick, Duke of Saxe-Coburg-Saalfeld, and Duchess Sophie Antoinette of Brunswick-Wolfenbüttel.