South Wales West (Welsh: Gorllewin De Cymru) is an electoral region of the Senedd, consisting of seven constituencies.

Each constituency elects one Member of the Senedd by the first past the post electoral system, and the region as a whole elects four additional or top-up Members of the Senedd, to create a degree of proportional representation.

The region is predominantly urban, taking in Wales' second-largest city, Swansea, as well as working-class towns such as Neath and Port Talbot.

A higher proportion of the local populace are Welsh speakers than in the neighbouring region, South Wales Central.

This table is for presentation purposes only In the 2016 National Assembly for Wales election, the results for additional members were as follows:[2] In the 2011 National Assembly for Wales election, the results for additional members were as follows: † Resigned as AM following his election to the UK House of Commons on 7 May 2015; replaced by Altaf Hussain from 19 May 2015.