Pen-rhiw (sometimes spelt "Penrhiw") is a hamlet in the community of Y Ferwig, Ceredigion, Wales, which is 74.8 miles (120.4 km) from Cardiff and 195.2 miles (314.2 km) from London. Pen-rhiw is represented in the Senedd by Elin Jones (Plaid Cymru) and is part of the Ceredigion constituency in the House of Commons.