West Wales (Welsh: Gorllewin Cymru) is a region of Wales.
It has various definitions, either covering Pembrokeshire, Ceredigion and Carmarthenshire, which historically comprised the Welsh principality of Deheubarth, and an alternative definition is to include Swansea and Neath Port Talbot, but exclude Ceredigion. The West Wales and the Valleys NUTS area also includes more westerly parts of North Wales as well as the South Wales Valleys.
The preserved county of Dyfed covers what is generally considered to be West Wales; between 1974 and 1996, Dyfed was a county, with a county council and six district councils.