Countess Elisabeth of Nassau (Elisabeth Flandrika) (Middelburg, 26 April 1577 – Sedan, 3 September 1642) was the second daughter of prince William of Orange and his third spouse Charlotte of Bourbon, and Duchess of Bouillon by marriage to Henri de La Tour d'Auvergne. She was the regent of Sedan during the absence of her spouse; between 1623 and 1626 during the minority of her son; and from 1632 during the absence of her son.