The Christmas Valley Sand Dunes are a natural sand dune complex covering 11,000 acres (45 km2) of public lands east of Christmas Valley in Lake County, Oregon, United States, about 100 miles (160 km) southeast of Bend.

[2] The dunes are composed mostly of ash and pumice from the eruption of Mount Mazama that formed Crater Lake 7,000 years ago.

The Bureau of Land Management also oversees the Lost Forest Research Natural Area, east of the dunes as well as the land around nearby Fossil Lake to the west In 1983, the Bureau of Land Management joined the Christmas Valley Sand Dunes, Lost Forest Research Natural Area, and Fossil Lake into a single Area of Critical Environmental Concern.

The nearest public facilities are located in the unincorporated community of Christmas Valley, approximately 16 miles (26 km) away.

[1][6] The Bureau of Land Management Road 6121 has been improved with gravel allowing access to the dunes during most of the winter and spring months.