Llanrwst is a market town and community on the A470 road and the River Conwy, in Conwy County Borough, Wales, and the historic county of Denbighshire. It developed round the wool trade and became known also for the making of harps and clocks. Today, less than one mile from the edge of Snowdonia, its main pursuit is tourism. Notable buildings include almshouses, two 17th-century chapels, and the Parish Church of St Grwst, which holds a stone coffin of Llywelyn the Great. The 2011 census gave it a population of 3,323.

The A470 is a trunk road in Wales. It is the country's longest road at 186 miles (299 km) and links the capital Cardiff on the south coast to Llandudno on the north coast. While previously one had to navigate the narrow roads of Llanidloes and Dolgellau, both these market towns are now bypassed due to extensive road modernisation. The 26 miles (42 km) from Cardiff Bay to Merthyr Tydfil are mainly dual carriageway, but most of the route from north of Merthyr to Llandudno is single carriageway.