Slagelse, a town in east Denmark, is in Slagelse municipality on the island of Zealand. It is about 100 km (62 mi) southwest of Copenhagen.
In the 11th century, Slagelse had a mint and was an important trading center. The city has an 11th-century church, and nearby is Trelleborg, a Viking fortress.
Hans Christian Andersen studied in the grammar school in this city for a few years but described it as a "nuisance".
Slagelse is twinned with Aberdare, Wales and Stargard Szczeciński, Poland