| Casau | |
| Settlement Type: | Decentralized municipal entity |
| Pushpin Map: | Spain Province of Lleida#Spain Catalonia#Spain |
| Pushpin Label: | Casau |
| Pushpin Label Position: | left |
| Subdivision Type: | Country |
| Subdivision Type1: | Community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Lleida |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Vielha e Mijaran |
| Population Total: | 68 |
| Coordinates: | 42.7058°N 0.7853°W[1] |
| Elevation M: | 1130 |
| Postal Code Type: | Postal code |
Casau (in Occitan (post 1500); pronounced as /kaˈzaw/) is a locality and decentralized municipal entity located in the municipality of Vielha e Mijaran, in Province of Lleida province, Catalonia, Spain. As of 2020, it has a population of 68.[2]
Casau is located 160km north of Lleida.