Member of the Senedd

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The Senedd Cymru – Welsh Parliament is composed of sixty members known as Members of the Senedd or MSs (Welsh: Aelodau o'r Senedd or ASau). Forty are chosen to represent an individual Senedd constituency, and twenty are chosen to represent the five electoral regions in Wales.

Each person in Wales is represented by five MSs: one for their constituency (the local area in which they live), and another four covering their region. Wales's five electoral regions are Mid and West Wales, North Wales, South Wales Central, South Wales East and South Wales West.[1]

Prior to May 2020, holders of this office were Assembly Members or AMs (Welsh: Aelodau'r Cynulliad or ACau).[2][3]

Methods of election[edit]

MSs are elected in one of two ways:[4]

  1. First-past-the-post constituency or
  2. Regional additional-member

Forty are elected as constituency MSs and twenty are elected as additional members, four from each of five regional groups of constituencies. This additional member system produces a form of proportional representation for each region.


All MSs positions become simultaneously vacant for elections held on a four-year cycle. If a vacancy arises at another time, due to death or resignation, it may be filled in one of two ways, depending on whether the vacancy is for a first-past-the-post constituency MS or for an additional-member MS.

A constituency vacancy may be filled by a by-election. An additional-member vacancy may be filled by the next available candidate on the relevant party list.

See also[edit]


  1. ^ Explore the Assembly education website Archived 11 January 2013 at the Wayback Machine
  2. ^ "Senedd and Elections (Wales) Act 2020". Retrieved 3 May 2020.
  3. ^ Commission, Assembly. "Explanatory Notes to Senedd and Elections (Wales) Act 2020". Retrieved 3 May 2020.
  4. ^ "Government of Wales Act 2006". Retrieved 9 April 2018.