Countess Henriëtte Adriana 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.

Henriëtte d'Oultremont was one of five children of Count Ferdinand L.F.M. d'Oultremont de Wégimont of Liège and his wife Johanna Susanna Hartsinck, an admiral's daughter,. Through her mother, she was related to Apollonius Jan Cornelis Lampsins, titular Baron of Tobago.

Around 1840, King William was facing discord in the Dutch population, due to his refusing to implement the reforms they demanded. This discord was enhanced when the king, a descendent of the strictly Protestant 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 consort Wilhelmine (1774-1837).

The resistance was so great—Henriëtte was Catholic and a native of Belgium, which had just established its independence from the Netherlands—that William decided to abdicate in favour of his son William II on 7 October 1840. After his abdication, he styled himself King Frederick William, Count of Nassau. He married Henriëtte on 17 February 1841; he was 71 years old at the time and she was 47. She called herself Countess of Nassau after her marriage. The couple resided in Berlin.

William I died two years later, in 1843. The couple had no children. Because of her devoted care for her elderly husband, the Dutch royal family awarded her and allowance and a castle near Aachen, where she died in 1864.

Henriëtte was not buried below the New Church in Delft with the Dutch kings and their queens; she was instead buried in the family vault in the chapel in the park surrounding Wégimont castle in Soumagne, near Liege in Belgium.

In the Netherlands, she was nicknamed Jetje Dondermond ("Henriëtte Thundermouth").
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