West Glamorgan, former county, S Wales. Created in the 1974 reorganization of Welsh local government from portions of Glamorgan and Monmouthshire, in the 1996 reorganization West Glamorgan was divided into the unitary authorities of Swansea and Neath and Port Talbot.

West Glamorgan is a preserved county and former administrative county of Wales, one of the divisions of the ancient county of Glamorgan.

West Glamorgan was created on April 1, 1974, by the Local Government Act 1972 from the county borough of Swansea, the boroughs of Neath and Port Talbot, the urban districts of Glyncorrwg and Llwchwr, Gower Rural District, Pontardawe Rural District, and all of Neath Rural District except the parish of Rhigos. The main council offices were based in County Hall, Swansea.

West Glamorgan had four districts, as follows:

• Swansea - Swansea CB and Gower RD
• Lliw Valley - Llwchwr and Pontardawe RD
• Neath - Neath and Neath RD
• Port Talbot - Port Talbot and Glyncorrwg

West Glamorgan County Council was abolished on April 1, 1996, being divided into the two unitary authorities of Swansea and Neath Port Talbot. Lliw Valley was partitioned between the two authorities.

West Glamorgan has remained in existence as a preserved county for some limited functions such as lieutenancy.