Anna Constantia von Brockdorff (17 October 1680 – 31 March 1765), later the Countess of Cosel, was a German lady-in-waiting and noblewoman, and mistress of Augustus the Strong, King of Poland and Elector of Saxony, in 1706-1713.
Eventually he turned against her and exiled her to Saxony, where she died after 49 years of internal exile.