The Wild Sky Wilderness is a 106,577-acre (431 km2) wilderness area in the western Cascade Range of Washington state. The wilderness is within the Mount Baker-Snoqualmie National Forest north of the U.S. Highway 2 towns of Index and Skykomish. The wilderness flanks, but does not include, the North Fork Skykomish River and the Beckler River. The Henry M. Jackson Wilderness is adjacent to the east and northeast. The highest point in Wild Sky Wilderness is 6,244 foot Gunn Peak.

The Mount Baker–Snoqualmie National Forest in Washington is a National Forest extending more than 140 miles (230 km) along the western slopes of the Cascade Range from the Canada–US border to the northern boundary of Mount Rainier National Park. Administered by the United States Forest Service, the forest is headquartered in Everett. There are local ranger district offices in North Bend and Skykomish.