Ystradfellte (Welsh pronunciation: [ˌəstradˈvɛɬtɛ] ⓘ) is a village and community in Powys, Wales, about 6 miles (10 km) north of Hirwaun, with 556 inhabitants.

It belongs to the historic county of Brecknockshire (Breconshire) and the Fforest Fawr area of the Brecon Beacons National Park, beside the Afon Mellte river.

Ystradfellte is chiefly known in history as the place where the Welsh nobleman and rebel leader Llywelyn Bren surrendered at the end of his revolt of 1316.

[4] The village is a popular tourist centre for its hillwalking, waterfalls and caves along the nearby rivers.

Ystradfellte has a public house, the New Inn, which provides camping facilities for visitors,[5] and Croydon Caving Club.