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Cottonwood Canyon State Park is a state park in the U.S. state of Oregon. Established in 2013, it is the second-largest state park in Oregon, encompassing 8,000 acres (3,200 ha) on the lower John Day River. The park land is surrounded by an additional 10,000 acres of public land managed by the Bureau of Land Management (BLM), which is maintained in cooperation with the state to provide a contiguous recreation footprint of over 18,000 acres. The only Oregon State Park larger in size is Silver Falls State Park, which encompasses 9,064 acres (3,668 ha). In 2024, Cottonwood Canyon was officially certified as an International Dark Sky Park, recognizing its exceptional lack of light pollution and commitment to sky preservation.