Bargoed (Welsh: Bargod) is a town in the Rhymney Valley, Wales, one of the South Wales Valleys. It lies on the Rhymney River in the county borough of Caerphilly and straddles ancient boundary of Glamorgan and Monmouthshire, with Bargoed originally lying within the old county of Glamorganshire whereas Aberbargoed was in the old county of Monmouthshire.