Double-O Ranch Historic District | |
 Blacksmith's cabin at Double O Ranch site | |
   | |
| Location | Malheur National Wildlife Refuge |
|---|---|
| Nearest city | Burns, Oregon |
| Coordinates | 43°16′39″N 119°18′36″W / 43.27750°N 119.31000°W |
| Area | 10 acres (4.0 ha) |
| Built | 1880 |
| NRHP reference No. | 82001502[1] |
| Added to NRHP | October 25, 1982 |
The Double-O Ranch Historic District is located west of Harney Lake in Harney County in southeastern Oregon, United States. At one time, the Double-O Ranch covered over 17,000 acres (69 km2). The ranch was owned by Bill Hanley, a well-known cattle baron and Bull Moose progressive. In 1941, the United States Government purchased most of the Double O Ranch property and added it to the Malheur National Wildlife Refuge. The two remaining Double-O Ranch buildings are now listed on the National Register of Historic Places.