Member of the Senedd

Members of the Senedd (MSs; Welsh: Aelodau o'r Senedd or ASau)[note 1] are representatives elected to the Senedd (Welsh Parliament; Welsh: Senedd Cymru). There are sixty members, with forty members chosen to represent individual Senedd constituencies, and twenty to represent the five electoral regions of the Senedd in Wales.

Member of the Senedd
Welsh: Aelodau o'r Senedd
TypeMember of Parliament
AbbreviationMS, (Welsh: AS)
Member ofthe Senedd
ResidenceSenedd building
SeatList of constituencies and electoral regions
Term length5 years
Constituting instrumentGovernment of Wales Act 1998
Inaugural holder1st National Assembly
Unofficial namesMember of the Welsh Parliament
Salary£ 67,649

Each person in Wales is represented by five MSs: one for their local constituency (encompassing their local area where they reside), and another four covering their electoral region (a large grouping of constituencies). Wales's five electoral regions are Mid and West Wales, North Wales, South Wales Central, South Wales East and South Wales West.[1]

Holders of this office were formerly known as Assembly Members (AMs; Welsh: Aelodau'r Cynulliad or ACau), under the legislature's former name, the National Assembly for Wales, until 2020 when it adopted its current names (Welsh Parliament; Senedd Cymru), simply referred to as Senedd.[2][3]

Since 2011, members are elected for a five-year term of office under an additional member system, in which 40 MSs represent smaller geographical divisions known as "constituencies" and are elected by first-past-the-post voting, and 20 MSs represent five "electoral regions" using the D'Hondt method of proportional representation. Typically, the largest party holding the largest number of MSs in the Senedd forms the Welsh Government, and in the event of not securing a majority of MSs, the largest party has first rights to begin coalition talks with other smaller parties.

Methods of election

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.


  1. Alternatively referred to in English-language media, using the official English name, the Welsh Parliament, as Members of the Welsh Parliament or Welsh Parliament Members, however, members are officially known as Members of the Senedd (MS).

See also


  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.