| Guadiana Valley Natural Park | |
| Iucn Category: | V |
| Location: | Distrito de Beja |
| Nearest City: | Mértola, Serpa |
| Coordinates: | 37.6506°N -7.645°W |
| Area Km2: | 697 |
| Established: | 18 November 1995 |
| Governing Body: | Institute for Nature Conservation and Forests |
Guadiana Valley Natural Park (Portuguese: Parque Natural do Vale do Guadiana) is a natural park in southeastern Portugal. It is one of the 30 areas which are officially under protection in the country.
The top of the flow gage tower was reached by the Guadiana twice in 50 years.[1]