The High Cascades Complex was a group of 20 fires burning in four protected areas in Oregon, in the United States, specifically: Crater Lake National Park, Rogue River – Siskiyou National Forest, Umpqua National Forest, and Fremont–Winema National Forest. The first fire in the complex, the Blanket Creek Fire, was started by a lightning strike on July 29, 2017. In total, the fires have burned 72,309 acres (293 km2) and are 28% contained. The fires are directly impacting the communities of Prospect, Union Creek and Diamond Lake, park headquarters, old growth forests that house endangered species like the spotted owl and volcanic features.

Umpqua National Forest, in southern Oregon's Cascade Range, covers an area of 983,129 acres (3,978.58 km2) in Douglas, Lane, and Jackson counties, and borders Crater Lake National Park. The four ranger districts for the forest are the Cottage Grove, Diamond Lake, North Umpqua, and Tiller ranger districts. The forest is managed by the United States Forest Service, headquartered in Roseburg.