Stéphanie, Grand Duchess of Baden (Stéphanie Louise Adrienne de Beauharnais; August 28, 1789 – January 29, 1860) was the Grand Duchess consort of Baden by marriage to Karl, Grand Duke of Baden.

Born in Versailles at the beginning of the French Revolution, Stéphanie was a great-granddaughter to Claude de Beauharnais (1680–1738) and Renée Hardouineau (1696–1744) who were married in La Rochelle during 1713. Their oldest son was François de Beauharnais, Marquess de la Ferte-Beauharnais (1714–1800) who served as a governor of Martinique. Their younger son was Claude de Beauharnais, 1st Count des Roches-Baritaud (1717–1784), Stephanie's paternal grandfather.

Claude was married in 1753 to Marie Anne Françoise Mouchard (1738–1813), known in poetry as Fanny de Beauharnais. Their oldest son was Claude de Beauharnais, 2nd Count des Roches-Baritaud (1756–1819). In 1783 the 2nd Count married Claudine Françoise de Lezay (1767–1791). The marriage resulted in the birth of first her older brother Alberic de Beauharnais (1786–1791) and then Stephanie herself. Her father was remarried in 1799 to Suzanne Fortin-Duplessis (1775–1850). The second marriage resulted in the birth of her half-sister Joséphine de Beauharnais, Marchioness de Quiqueran-Beaujeu (1803–1870).

The fates of her family however would be defined by another Joséphine. On December 13, 1779 Alexandre, Vicomte de Beauharnais, first cousin of her father, was married to Joséphine Tascher de la Pagerie. On July 23, 1794, Alexandre was guillotined. Joséphine had affairs with several influential figures of the French Directory, including Paul François Jean Nicolas Barras. The latter would introduce her to his recent favorite Napoléon Bonaparte. Napoléon soon started courting her. On March 9, 1796 they were married.

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