MidGlamorgan, former county, southern Wales, bordered on the north by Powys, on the east by Gwent, on the south by South Glamorgan, and on the west by the Bristol Channel and West Glamorgan.
The city of Cardiff in South Glamorgan was the administrative centre of the county, as well as the capital of Wales.
MidGlamorgan was established under the local government reforms of 1974, when the old county of Glamorganshire was divided into three new ones: Mid, South, and West Glamorgan.