Ystradgynlais is a town on the River Tawe in south west Powys, Wales. It the traditionally lies in Brecknockshire. The town grew around the iron-making, coal-mining and watch-making industries.
Ystradgynlais hosted the 1954 edition of the National Eisteddfod which is an annual Welsh festival of literature, music, and song.
The century-old award-winning Ystradgynlais Public Band competed in the 2005 National Eisteddfod. It is the hometown of the actress Eve Myles.
Ystradgynlais is one of the few areas within old Brecknockshire, which has a high proportion of Welsh-speakers, indeed, according to the 2001 census, over half of all the Welsh-speakers within Brecknock district live in Ystradgynlais itself.
Football: Ystradgynlais FC
Miners Welfare and Community Hall
Gough Arms Hotel
108 Brecon Road
Rugby: Ystradgynlais RFC
Derwen Rd Garage