| Großer Dieckfluss | |
| Mouth Location: | Große Aue |
| Mouth Coordinates: | 52.5056°N 8.6562°W |
| Subdivision Type1: | Country |
| Length: | 37.5km (23.3miles) |
| Basin Size: | 179km2 |
The Großer Dieckfluss is a river of North Rhine-Westphalia, Germany. It flows into the Große Aue in Preußisch Ströhen.