| Warner Valley | |
|---|---|
 Hart Mountain overlooking the Warner Wetlands | |
 | |
| Geography | |
| Location | Lake County, Oregon |
| Borders on | Hart Mountain (east) Warner Mountains (west) |
| Coordinates | 42°04′40″N 119°55′30″W / 42.0777°N 119.925°W |
The Warner Valley is a valley in south-central Oregon in the United States. It is a remote valley at the northwestern corner of North America's Basin and Range Province. The valley is home to a chain of lakes and wetlands known as the Warner Lakes. Native Americans were present in the Warner Valley for thousands of years before European explorers arrived in the 19th century. It is the site of Fort Warner, built by the United States Army in 1867. The fort was used as a supply depot and administrative headquarters during a protracted Army campaign against Northern Paiute bands in eastern Oregon and northern California. Today, livestock ranching is the main commercial activity in the valley. The Warner Valley offers a number of recreational opportunities including hunting, fishing, bird watching, and wildlife viewing.