Brunsbüttel (German pronunciationⓘ; Northern Low Saxon: Bruunsbüddel) is a town in the district of Dithmarschen, in Schleswig-Holstein, northern Germany that lies at the mouth of the Elbe river, near the North Sea.

The earliest reference to the town is in a document dated 14 July 1286.

[citation needed] With the construction of the Kiel Canal (German: Nord-Ostsee-Kanal) in 1911, the town was divided in two.

149 Squadron RAF carried out the second bombing of that war, targeting warships near the town.

The ChemCoast Park Brunsbüttel is still the most important enterprise zone and at 2,000 hectares (4,900 acres) also the largest industrial area in Schleswig-Holstein.