Grand Teton National Park is a United States National Park in northwestern Wyoming. Approximately 310,000 acres (130,000 ha) in size, the park includes the major peaks of the 40-mile (64 km) long Teton Range as well as most of the northern sections of the valley known as Jackson Hole. Only 10 miles (16 km) south of Yellowstone National Park, the two parks are connected by the National Park Service managed John D. Rockefeller, Jr. Memorial Parkway. These three protected areas in conjunction with surrounding National Forests constitute the Greater Yellowstone Ecosystem, which at almost 18,000,000 acres (7,300,000 ha) is one of the largest intact mid-latitude temperate ecosystems in the world.

Human history of the Grand Teton region dates back at least 11,000 years, when the first nomadic hunter-gatherer Paleo-Indians would migrate into the region during warmer months in pursuit of food and supplies. In the early 19th century, the first Caucasian explorers encountered the eastern Shoshone natives. Between 1810 and 1840, the region attracted various fur trading companies which vied for control of the lucrative beaver fur trade. U.S. Government expeditions to the region commenced in the 1870s as an offshoot of exploration in Yellowstone, and the first permanent white settlers in Jackson Hole arrived in the 1880s. Efforts to preserve the region as a national park commenced in the late 19th century and by 1929, Grand Teton National Park had been established, protecting the major peaks of the Teton Range. The valley of Jackson Hole remained in private ownership until the 1930s, when conservationists led by John D. Rockefeller, Jr. began purchasing land in Jackson Hole to be added to the existing national park. Against public opinion and with repeated congressional efforts to repeal the measures, much of Jackson Hole was set aside for protection as Jackson Hole National Monument in 1943. The monument was abolished in 1950 and most of the monument land was added to Grand Teton National Park.