Greenbrier is a valley in the northern Great Smoky Mountains of Tennessee, located in the southeastern United States. Now a recreational area located within the Great Smoky Mountains National Park, Greenbrier was once home to several Appalachian communities.
Greenbrier is situated along the Middle Fork of the Little Pigeon River, stretching from Porters Flat in the south to Emert's Cove in the north, at the present park boundary. The area also includes the Middle Fork's immediate watershed from the crest of Grapeyard Ridge to the west (opposite the Roaring Fork area) to Snag Mountain in the east. The area is sometimes called Big Greenbrier to distinguish it from Little Greenbrier, which is located between Wears Valley and Elkmont several miles to the west.