The Frutz is a river of Vorarlberg, Austria, a tributary of the Rhine.

The Frutz is long. Its source is in the Frutz Alpine shieling. It flows in a western direction through the valley in the area of Feldkirch to the Rhine. At Rankweil, the river divides into a side and main arm.The Eastern Alps, Including the Bavarian Highlands, Tyrol, Salzburg, Upper and Lower Austria, Styria, Carinthia, and Carniola: Handbook for Travellers. K. Baedeker, 1891. 206. The smaller one has an own name called . Both arms discharge separately at Koblach into the Rhine.

The main settlements on the Frutz are Sulz, Rankweil and Koblach.

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