Mid Glamorgan (Welsh: Morgannwg Ganol) is a preserved county of Wales. From 1974 until 1996 it was also an administrative county with a county council.
Mid Glamorgan was formed in 1974 under the Local Government Act 1972. It consisted of part of the former administrative county of Glamorgan and the county borough of Merthyr Tydfil, along with the parishes of Penderyn and Vaynor from Brecknockshire and the urban districts of Bedwas and Machen, Rhymney and part of Bedwellty, from Monmouthshire.