Valley is a village near Holyhead/Caergybi on the west coast of Anglesey, North Wales. Population (2001) 2,413.
In Welsh it is referred to as either Y Dyffryn (meaning The Valley) or [Y] Fali (pronounced as Valley). Recent research, prompted by local opposition to the name of Y Fali, suggested that Valley may be a corruption of the Irish Bally (settlement), or Baile as it is spelled in Irish. There does not appear to be a traditional Welsh language placename for the village, and thus there has been a reversion to Valley of late. There is no actual valley as the area is very flat, although a dip in the land was created when the Stanley Embankment to Holy Island was constructed, and this may be the origin of the name.
RAF Valley is a nearby Royal Air Force station concerned with the training of fast jet pilots. The runways are also used by Anglesey Airport who make commercial flights to Cardiff and The Isle of Man. Valley railway station is on the North Wales Coast Line.