The River Arrow (Welsh: Afon Arwy) is a river in the Welsh Marches, rising in Powys in Wales, then flowing into the English county of Herefordshire. It rises near Gwaunceste Hill, then flows south-east through Newchurch and Michaelchurch-on-Arrow.
It forms a short section of the England/Wales boundary, before flowing into Herefordshire, and through the town of Kington. It proceeds east through Herefordshire, passing Lyonshall, Staunton-on-Arrow, Pembridge, Eardisland, Arrow Green, Monkland, Ivington, Broadward, and has its confluence with the River Lugg south of Leominster, at Stoke Prior.