Llanelli is a constituency of the House of Commons of the Parliament of the United Kingdom. From 1918 to 1970 the official spelling of the constituency name was Llanelly. It elects one Member of Parliament (MP) by the first past the post system of election. Since 2005, it is currently represented by Nia Griffith of the Labour Party.

Llangennech ( ) is a village and community in the area of Llanelli, Carmarthenshire, Wales, which covers an area of 1,222 hectares (4.72 sq mi).