Pentrebach or Pentre-bach is a village in City and County of Swansea, Wales within the Pontarddulais ward and the community of Pontarddulais. It is part of the historic county of Glamorgan.
The nearest hospital with an Accident and Emergency department is Ysbyty Morforus, Swansea (approximately ).
The nearest primary school is Ysgol Glantwymyn.
The nearest secondary school is Ysgol Gyfun Penyrheol
The nearest train station is Pontarddulais railway station.
Pentrebach is represented in the Senedd (the Welsh Parliament) by Rebecca Evans (Welsh Labour) and the United Kingdom Member of Parliament is Tonia Antoniazzi (Labour Party).