|Lliw Valley / Dyffryn Lliw|
|- Succeeded by||Swansea
Neath Port Talbot
|- HQ||Civic Centre Penllergaer|
|- Motto||Nid da lle gellir gwell (From good things to better)|
The Borough of Lliw Valley (Welsh: Dyffryn Lliw) was one of the four local government districts of West Glamorgan, Wales from 1974 to 1996. It was formed by the merger of the Llwchwr urban district and Pontardawe Rural District, under the Local Government Act 1972.
Communities becoming part of Swansea:
Communities becoming part of Neath Port Talbot:
The old Lliw Valley had two football clubs in the Welsh Football League - Garden Village and Pontardawe Town.