North Fork Owyhee Wilderness, Nature reserve in Owyhee County, Idaho, United States.

North Fork Owyhee Wilderness is a protected area on high basalt plateaus in Owyhee County, southwestern Idaho. It contains canyons over 1,000 feet deep, sagebrush and grassland plateaus, and volcanic rhyolite and basalt formations. The upper 20.8 miles of the North Fork Owyhee River are part of the National Wild and Scenic Rivers System.

The North Fork Owyhee Wilderness was created by the Omnibus Public Land Management Act of 2009, signed into law by President Barack Obama on March 30, 2009. The same act established five other wilderness areas in Owyhee County, together known as the Owyhee Canyonlands Wilderness Areas, and added 517,025 acres of wilderness in Idaho.

The area is cherished by visitors who prefer to explore on foot, as motorized vehicles and heavy machinery are not permitted. This rule shapes the experience and encourages a quieter, less disturbed way of discovering the land.

No roads or buildings exist inside the wilderness, and motorized or mechanical equipment, bicycles included, is prohibited; camping and fishing need a proper permit, and hunting is allowed in season. The upper 20.8 miles of the North Fork Owyhee River, from the Oregon border upstream, are managed as Wild and Scenic River, with 15.1 miles classified wild and 5.7 miles recreational. Plan for self-supported travel on foot or horseback.

The upper 20.8 miles (33.5 km) of the North Fork Owyhee River, from the Idaho–Oregon border to the wilderness boundary, belong to the National Wild and Scenic Rivers System: 15.1 miles are classified wild and 5.7 miles recreational. The rivers here carry whitewater rapids up to Class IV.