Bargoed is a town and community in the Rhymney Valley, Wales, one of the South Wales Valleys. It lies on the Rhymney River in the county borough of Caerphilly. It straddles the ancient boundary of Glamorgan and Monmouthshire, with Bargoed lying in Glamorgan and Aberbargoed in Monmouthshire. 'Greater Bargoed', as defined by the local authority Caerphilly County Borough Council, consists of the towns of Bargoed and Aberbargoed and the village of Gilfach.