Merthyr Dyfan or Dyfan is a northeastern suburb of Barry in the Vale of Glamorgan, in south Wales, formerly an independent medieval village. It is also an ecclesiastical parish and a formal electoral ward of the Vale of Glamorgan. It borders Colcot to the west, Buttrills to the southwest and Gibbonsdown to the southeast. Its main roads are Merthyr Dyfan Road, a hilly road leading down from the A4050 road (Port Road) which leads into Wenvoe and Cardiff; and Skomer Road which separates it from Gibbonsdown and eventually also leads to the A4050 road. Merthyr Dyfan contains an old parish church, , Bryn Hafren Comprehensive School and the Master Mariner Pub and Holm View Leisure Centre, although the last two could be considered to be in northern Gibbonsdown.