The publication in 2000 of the three-volume Cambridge Urban History of Britain presented British urban historians with an ideal opportunity to take stock of the current state of research in their discipline. For Welsh urban historians it raised a number of particularly thorny issues. Whilst it contained some important chapters focused exclusively on the history of Welsh towns, it also identified Wales as one of the most under-researched areas of urban Britain. This special issue, dedicated specifically to Welsh urban history, has been conceived in part as a response to that finding. It also represents the collective efforts of scholars, new and established, whose research on urban Wales was presented at a conference on ‘Understanding Urban Wales’ at the University of Wales Swansea in September 2003. The event demonstrated the existence of a healthy ‘critical mass’ of scholarship, at both postgraduate and postdoctoral level, on Welsh towns and their development.