Aberdare (UK Parliament constituency)

Aberdare
Former Borough constituency for the House of Commons
1918–1983
Number of members	One
Replaced by	Cynon Valley
Created from	Merthyr Tydfil

Aberdare was a constituency in the Parliament of the United Kingdom. It was created for the 1918 general election and returned one Member of Parliament (MP) by the first past the post system until it was abolished for the 1983 general election. The Labour Party captured the seat in 1922 and held it comfortably until its abolition

The constituency consisted of the two neighbouring towns of Aberdare and Mountain Ash in Glamorgan, Wales. When the seat was abolished in 1983, it was largely replaced by the Cynon Valley seat.

Under the Representation of the People Act 1918, the existing parliamentary borough of Merthyr Tydfil was divided into two single-member constituencies. One of these was Merthyr Tydfil, Aberdare Division, which consisted of the two urban districts of Aberdare and Mountain Ash.

The Representation of the People Act 1948 reorganised constituencies throughout Great Britain, and introduced the term "borough constituency" in place of "parliamentary borough". The duly renamed Aberdare Borough Constituency was again defined as consisting of the Aberdare and Mountain Ash urban districts. The renamed constituency was first contested at the 1950 general election. It was unchanged at the next revision of constituencies in 1970, continuing with the same name and boundaries until its abolition in 1983.

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