Wasbek is a municipality, immediately west of Neumünster, in the district of Rendsburg-Eckernförde, in Schleswig-Holstein, Germany.

In the east runs Federal Highway 7 from Hamburg to Flensburg through the village area and is on the Neumünster-Mitte exit.

The Bundesstraße 430 from Lütjenburg to Schenefeld (Federal highway 23) runs from east to west through the municipality.

Wasbek is south of the municipality of Timmaspe or Krogaspe, north of Ehndorf and east of Aukrug (see regional map at: Rendsburg-Eckernförde).

In the crest a left-oblique silvery wave divides green and red areas.