Ystradfellte is a village and community in Powys, Wales, about 6 miles north of Hirwaun, with 556 inhabitants. It belongs to the historic county of Brecknockshire and the Fforest Fawr area of the Brecon Beacons National Park, beside the Afon Mellte river. The village is linked by minor roads with Heol Senni to the north and the A4059 north of Penderyn, and with Pontneddfechan, which lies in the community, at the head of the Vale of Neath to the south.