Merthyr Tydfil (; ) is a town in Wales, with a population of about 59,500, situated approximately north of Cardiff. Once the largest town in Wales, it is now the 14th largest urban area in Wales. It is in the historic county of Glamorgan and is currently the main town in Merthyr Tydfil County Borough administered by Merthyr Tydfil County Borough Council. Both the town and the county borough are often referred to as 'Merthyr'.