The Fremont–Winema National Forest is a United States National Forest formed from the 2002 merger of the Fremont and Winema National Forests. They cover territory in southern Oregon from the crest of the Cascade Range on the west past the city of Lakeview to the east. The northern end of the forests is bounded by U.S. Route 97 on the west and Oregon Route 31 on the east. To the south, the state border with California forms the boundary of the forests. Klamath Falls is the only city of significant size in the vicinity. The forests are managed by the United States Forest Service, and the national forest headquarters are located in Lakeview.

The Fremont-Winema National Forest of south central Oregon is a mountainous region with a rich geological, ecological, archaeological, and historical history. Founded in 1908, the Fremont National Forest was originally protected as the Goose Lake Forest Reserve in 1906. The name was soon changed to Fremont National Forest, named after John C. Frémont, who explored the area for the United States Army Corps of Engineers in 1843. It absorbed part of Paulina National Forest on July 19, 1915. In 2002, it was administratively combined with the Winema National Forest as the Fremont–Winema National Forests.