Wilster (German pronunciation: [ˈvɪlstɐ] ⓘ) is a town in Steinburg district in Schleswig-Holstein, Germany.

Wilster forms the centre of the Wilstermarsch, a major cattle raising area in Germany.

On 1 July 2005, the town administration and the Amt of Wilstermarsch merged into one authority.

In 2018, the transformers for the NordLink power cable were installed in Wilster.

[2] The Old Town Hall built in 1585 is among Schleswig-Holstein's finest preserved Renaissance buildings.