| Ötztaler Ache | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Austria |
| Subdivision Type2: | State |
| Subdivision Name2: | Tyrol |
| Map: | Ötztaler Ache.png |
| Source1 Location: | Ötztal Alps |
| Mouth Location: | Inn |
| Mouth Coordinates: | 47.2322°N 10.8383°W |
| Length: | 66.5km (41.3miles) |
| Basin Size: | 893km2 |
The Ötztaler Ache is a river in the district of Imst, Tyrol state of Austria. It is a right tributary of the Inn. It flows through the Ötztal valley, a southern branch the Inntal. Including its source rivers and, it is 66.5km (41.3miles) long. The Rofenache is the runoff of the, a glacier at the foot of the Weißkugel, Ötztal Alps. At, near Sölden, it takes up the and its name changes to Venter Ache. At the confluence with the in, Sölden, the Ötztaler Ache proper is formed. It flows through Sölden, Längenfeld, Umhausen and Oetz before joining the Inn 8km (05miles) east of Imst. The river is one of its bigger tributaries.