The Wisper is a 29.7-kilometre-long (18.5 mi) river in Hesse, Germany, right tributary of the Rhine.

Its source is in the western Taunus, Rheingau-Taunus-Kreis district, near a small village named Wisper (municipality Heidenrod).

It flows southwest through a densely forested valley with some medieval castle ruins surrounded by a popular hiking area.

A man-made lake, the Wispersee, is stocked with trout and is a popular fishing destination.

This article related to a river in Hesse is a stub.