Schleswig is an area of southern Jutland, divided between Denmark and Germany, sometimes referred to as Sleswick in English.

Schleswig may also refer to:

Places Schleswig, Schleswig-Holstein, a city in Germany Schleswig, Iowa, a city in the United States Schleswig, Wisconsin, a city in the United States Regions Duchy of Schleswig, a duchy abolished in 1866 Northern Schleswig, the Danish part of Schleswig Southern Schleswig, the German part of Schleswig

See also Schleswig-Holstein, a state of Germany Slesvig (disambiguation)