Swansea West (Welsh: Gorllewin Abertawe) is a constituency of the Senedd.

It is also one of seven constituencies in the South Wales West electoral region, which elects four additional members, in addition to seven constituency members, to produce a degree of proportional representation for the region as a whole.

The other six constituencies of the region are Aberavon, Bridgend, Gower, Neath, Ogmore and Swansea East.

In general elections for the Senedd, each voter has two votes.

Want of an Official Mark (0), Voting for more than ONE party or individual candidate (39), Writing or mark by which the Voter could be identified (14), Unmarked or Void for uncertainty (97) Regional ballots rejected: 214[8] 2003 Electorate: 58,749 Regional ballots rejected: 460 1999 Electorate: 59,369