Clwyd South (UK Parliament constituency)

Clwyd South
County constituency for the House of Commons
Boundary of Clwyd South in Wales.
Preserved county	Clwyd
Electorate	54,895 (December 2010)
Major settlements	Ruabon, Rhosllannerchrugog, Llangollen
Current constituency
Created	1997
Member of parliament	Susan Jones (Labour)
Number of members	One
Created from	Clwyd South West, Wrexham
Overlaps
Welsh Assembly	North Wales
European Parliament constituency	Wales

Clwyd South (De Clwyd in Welsh) is a constituency of the House of Commons of the Parliament of the United Kingdom (Westminster). The constituency was created in 1997, and it elects one Member of Parliament (MP) by the first past the post method of election.

The Clwyd South Welsh Assembly constituency was created with the same boundaries in 1999.

The constituency straddles the authorities of Denbighshire and Wrexham. Main population centres includes the Wrexham suburbs of Ruabon, Chirk, Rhosllannerchrugog, Cefn Mawr and Coedpoeth, and Llangollen and Corwen further up the Dee valley to the west. Until the 2010 election, the constituency used to include a small part of the preserved county of Powys. This anomaly was resolved by the Boundary Commission for Wales with the boundaries first used in 2010.

However, under constituency changes announced in September 2016 by the Boundary Commission, it is proposed that for the next general election the northern part of the Montgomeryshire constituency area of Powys including Welshpool be merged with this seat to form a new seat, named South Clwyd and North Montgomeryshire.