| Ranna | |
| Map: | Ranna.png |
| Source1 Coordinates: | 48.6786°N 13.7338°W |
| Mouth Coordinates: | 48.4741°N 13.7759°W |
| Subdivision Type1: | Countries |
| Subdivision Type2: | States |
Ranna is a river of Bavaria, Germany and of Upper Austria, Austria.
The Ranna springs southeast of Sonnen in Bavaria. It discharges at Rannamühl (Pfarrkirchen im Mühlkreis) from the left into the Danube.