Jean Henri Desmercières (8 May 1687 – 8 March 1778) was a French-Danish merchant, banker and major landowner in Holstein where he reclaimed large areas along the North Sea coast.

Born in Paris, Desmercières was the illegitimate son of Jean Henri Huguetan by a woman in the fashion industry.

[1] He belonged to Count Johann Hartwig Ernst von Bernstorff's social circle but was apparently not held in very high regard by him.

The work was continued by Heinrich XLIII, Count Reuss of Ebersdorf, a nephew of Desmercières' half sister Marguerite Huguetan, Countess Gyldensteen.

He did, however, receive his father's town mansion in Bredgade (now Hotel Phoenix Copenhagen) as well as the country house Tusenborg at Kongens Lyngby.