| Rienz | |
| Source1 Coordinates: | 46.6342°N 12.2986°W |
| Subdivision Type1: | Country |
| Length: | approx. 80km (50miles) |
| Source1 Elevation: | 2180m (7,150feet) |
| Mouth Coordinates: | 46.7129°N 11.6606°W |
The Rienz (pronounced as /de/; it|Rienza pronounced as /it/) is a river in South Tyrol, Italy. Its source is located at 2,180 m of altitude, in the Dolomites mountains, south of Toblach: near Toblach it enters in the Puster Valley, and, after 90km (60miles), it meets the Eisack river in the city of Brixen, at 550 m of altitude.
The Rienz flows through the following municipalities (source to mouth): Toblach, Niederdorf, Welsberg-Taisten, Olang, Rasen-Antholz, Bruneck, St. Lorenzen, Kiens, Vintl, Mühlbach, Rodeneck and Brixen.
The most significant affluents are:
The maximum discharge of the Rienz is around 60 m3/s.