The Ruwer is a river in Germany with a length of 46 kilometres (29 mi).

The valley of the Ruwer is a part of the Moselle wine-growing region near Trier in the state of Rhineland-Palatinate.

In A.D. 371, the Ruwer was mentioned by the Roman poet, Ausonius, in his poem, Mosella as follows: "The Ruwer turns the corn-grinding millstones in giddy whirls and draws the shrieking saws through smooth marble blocks."

Other tributaries of the Ruwer include the Apfelbach, Borgraben, Eitelsbach, Gusterather Waschbach, Kundelbach, Labach, Moertschelbach, Rimperterbach, Wenigbach, Wenzelbach and the Wilzenburger Waschbach.

In and by the Ruwer live numerous rare and protected species, such as the bullhead,[4] dipperl,[5] purple emperor butterfly and the kingfisher.