The Duchesses of Schleswig-Holstein were the consorts of the rulers of Schleswig-Holstein and the separate states of Schleswig and Holstein, before that, the two duchies of Schleswig and Holstein. This article would focus more on the Duchess consorts of Schleswig and Holstein, Schleswig-Holstein (in pretense), and the many branches of the Schleswig-Holstein duchy created by the Danish king for his relatives.
The following list is a list the spouse of the jarls and dukes, who ruled over Schleswig respectively Southern Jutland (Sønderjylland).