Llaingarreglwyd is a hamlet in the community of Llanarth, Ceredigion, Wales, which is 70 miles (112.6 km) from Cardiff and 185.3 miles (298.1 km) from London. Llaingarreglwyd is represented in the Senedd by Elin Jones (Plaid Cymru) and is part of the Ceredigion constituency in the House of Commons.