Cardiff South & 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 constituency created in 1983 represented in the House of Commons of the UK Parliament. It is the largest such entity in Wales, with an electorate of 75,175 and one of the most ethnically diverse. It has been won by the Labour Party candidate since its creation in 1983.

Prior to 1983 Penarth had been part of the disbanded Barry constituency. Most of the electorate of Cardiff South and Penarth had previously fallen into the abolished seat of Cardiff South East.

Cardiff South and Penarth has had three MPs since it was created. The first, elected in the 1983 general election, was the former Labour Prime Minister James Callaghan, who secured the seat with a 5.5% majority over Conservative David Tredinnick. Callaghan had immediately before Parliament was dissolved represented Cardiff South East. Callaghan first became an MP in the 1945 general election, for Cardiff South.