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.[1] 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.[2]