Countess Henriëtte Adriana Maria Ludovica Flora d'Oultremont de Wégimont (28 February 1792 in Maastricht–26 October 1864 at Rahe Castle in Aachen) was the second, morganatic, wife of the first Dutch king, William I.

Around 1840, King William found himself in discord with much of the Dutch population due to his refusal to implement demanded reforms.

This discord was enhanced when the king, head of the strictly Protestant and royal House of Orange-Nassau, announced his intention to marry the Catholic Countess Henriëtte, who had been a lady-in-waiting to his first wife, the late Queen Wilhelmine (1774-1837).

[1][2] She had received the Dutch title, Countess of Nassau on 7 February 1841, by which she was known during the couple's subsequent retirement in Berlin.

[2] Because of her devoted care for her elderly husband, the Dutch royal family awarded her an allowance and a castle near Aachen, where she died in 1864.