Glamorgan or, sometimes, Glamorganshire ( or ) is one of the thirteen historic counties of Wales and a former administrative county of Wales. It was originally an early medieval petty kingdom of varying boundaries known as Glywysing until taken over by the Normans as a lordship. Glamorgan is latterly represented by the three preserved counties of Mid Glamorgan, South Glamorgan and West Glamorgan. The name also survives in that of Vale of Glamorgan, a county borough.

Glamorgan or, sometimes, Glamorganshire ( or ) is one of the thirteen historic counties of Wales and a former administrative county of Wales. It was originally an early medieval petty kingdom of varying boundaries known as Glywysing until taken over by the Normans as a lordship. Glamorgan is latterly represented by the three preserved counties of Mid Glamorgan, South Glamorgan and West Glamorgan. The name also survives in that of Vale of Glamorgan, a county borough.