Pilgerbach is a 8-kilometre-long (5.0 mi) river of north Hesse, Germany, in the district of Edermünde.

After leaving the forest, the river flows through arable land to the south-west of Besse, before it passes the westerly and southern parts of the same town and leaves the nature park.

Next to the L3221 road it reaches the basalt knoll Hahn before passing through Edermünde-Holzhausen.

On the western edge of this village it meets the Glisborn tributary, which comes from the southwest.

After passing under the Autobahn A49 it meets the tributary of the Hertingshausener Bach, and flows next to the L3221 road to the town of Grifte.