Glamorgan Archives is a local authority archive service for the authorities of Bridgend, Caerphilly, Cardiff, Merthyr Tydfil, Rhondda Cynon Taff and the Vale of Glamorgan.
Mae Archifau Morgannwg yn gwasanaethu awdurdodau Pen-y-bont ar Ogwr, Caerffili, Caerdydd, Merthyr Tudful, Rhondda Cynon Taf a Bro Morgannwg.