Cardiff South and Penarth (UK Parliament constituency)

Cardiff South and Penarth
Borough constituency for the House of Commons
Boundary of Cardiff South and Penarth in Wales.
Preserved county	South Glamorgan
Population	107,455 (2011 census)
Electorate	75,175 (December 2010)
Current constituency
Created	1983
Member of parliament	Stephen Doughty (Labour Co-operative)
Number of members	One
Created from	Cardiff South East & parts of Barry and Monmouth
Overlaps
Welsh Assembly	South Wales Central
European Parliament constituency	Wales

Coordinates: 51°28′08″N 3°07′37″W / 51.469°N 3.127°W / 51.469; -3.127

Cardiff South and Penarth (Welsh: De Caerdydd a Phenarth) is a borough constituency represented in the House of Commons of the Parliament of the United Kingdom. It is the largest parliamentary constituency in Wales, with an electorate of 75,175, and also one of the most ethnically diverse. It has been consistently held by the Labour Party since its creation in 1983.

Cardiff South and Penarth has only had three MPs since it was first created. The first, elected in the 1983 general election, was the former Labour Prime Minister James Callaghan, who secured the seat with only a 2,316 vote majority over Conservative candidate David Tredinnick. Callaghan had previously represented the constituency of Cardiff South East prior to its merger with Penarth in 1983. (Prior to 1983 Penarth had been part of the Barry constituency.) Callaghan had first entered Parliament as MP for the old Cardiff South constituency in the 1945 general election.