Schleswig is a town in the northeastern part of Schleswig-Holstein, Germany. It is the capital of the Kreis (district) Schleswig-Flensburg. It has a population of about 27,000, the main industries being leather and food processing. It takes its name from the Schlei (Slien), an inlet of the Baltic sea at the end of which it sits, and vik or vig which means "bay" in Old Norse and Danish. Schleswig or Slesvig therefore means "bay of the Schlei".

Schleswig-Holstein is the northernmost of the 16 states of Germany, comprising most of the historical Duchy of Holstein and the southern part of the former Duchy of Schleswig. Its capital city is Kiel; other notable cities are Lübeck and Flensburg. It covers an area of 15,763 km2 (6,086 sq mi), making it the 5th smallest German federal state by area.