The Greenbelt Lines designated as the Greenbelt–New Carrollton Line on Route G12, and Greenbelt Road-Good Luck Road Line on Route G14, are daily bus routes operated by the Washington Metropolitan Area Transit Authority between Greenbelt station of the Green Line of Washington Metro and New Carrollton station of the Orange Line of the Washington Metro. The lines operate every 30 minutes during peak hours and 60 minutes all other times. Both Route G12 and G14 trips are roughly 55 minutes long. Both routes provide service between New Carrollton and Greenbelt connecting travelers to both communities without having to enter Washington, D.C. by train.

Greenbelt station is a Washington Metro and MARC station in Prince George's County, Maryland. The station is the northeastern terminus of the Green Line of the Washington Metro. MARC commuter rail trains on the Camden Line also stop at Greenbelt on a set of tracks parallel to the Metro tracks.