Flag Pond is an unincorporated community in Unicoi County, Tennessee. It is part of the Johnson City Metropolitan Statistical Area, which is a component of the Johnson City-Kingsport-Bristol, TN-VA Combined Statistical Area – commonly known as the Appalachian Highlands region.

The community's name is believed to be derived from the presence of "flag flowers" (wild iris) growing in wet areas at the edge of a local pond.

Flag Pond is the location of a post office, assigned ZIP code 37657.

Flag Pond is the location of the Lamar Alexander Rocky Fork State Park.

Flag Pond is located along Old Asheville Highway the former route of US 23. The community can accessed via Interstate 26/US 23 exits 43, 46 and 50.

36°00′55″N 82°33′26″W / 36.01528°N 82.55722°W / 36.01528; -82.55722