State Route 139 is a Georgia state route that starts in Clayton County at SR 85 in Riverdale, and ends at Veterans Memorial Highway (US 78/US 278/SR 8) in Mableton. The portion of SR 139 in College Park has been rerouted around the new Atlanta Airport runway, which crosses over I-285.

The route is co-signed with US 29 and SR 14 from the Atlanta Airport north to the West End neighborhood of Atlanta.