Constance Wilhelmine de Saint-Priest (1752–1807), was a French countess. She was active as a spy and diplomat in Sweden. She was born to count , Ambassador of Naples in Constantinople, and Catherine Chabert, and married the ambassador of France, François-Emmanuel Guignard, comte de Saint-Priest, in October 1774. Constance Wilhelmine de Saint-Priest was rewarded by Gustaf Adolf Reuterholm by being admitted to court again and by having a position at court secured for her current lover Aminoff. She died in Stockholm.