Rhydroser is a hamlet in the community of Llanrhystud, Ceredigion, Wales, which is 68.5 miles (110.3 km) from Cardiff and 178 miles (286.5 km) from London. Rhydroser is represented in the Senedd by Elin Jones (Plaid Cymru) and is part of the Ceredigion constituency in the House of Commons.