The Schussen is a 59-kilometre-long (37 mi) tributary of Lake Constance (Bodensee), which drains to the High Rhine, in the southern portion of Upper Swabia in Baden-Württemberg (Germany).

From its source, not far from the Lake Feder, around 1.5 km (0.93 mi) north of Bad Schussenried, where it runs down the watershed between the Rhine and the Danube, to the Bodensee.

The river passes south of Aulendorf through its own valley in the northern part of the Altdorf Forests, through the Schussen ravine by Durlesbach and by Mochewangen (Wolpertswende), and from there into the broad Schussen Valley.

Several streams enter the Schussen, including the Wolfegger Ach, which originates between Binningen and Niederbiegen (both are part of the community of Baienfurt).

Other tributaries include the Scherzach, Scharzach, and the Ravensburg city creek.