The Nantgarw China Works was a porcelain factory, later making other types of pottery, located in Nantgarw on the eastern bank of the Glamorganshire Canal, 8 miles (13 km) north of Cardiff in the River Taff valley, Glamorganshire, Wales. The factory made porcelain of very high quality, especially in the years from 1813–1814 and 1817–1820. Porcelain produced by Nantgarw was extremely white and translucent, and was given overglaze decoration of high quality, mostly in London or elsewhere rather than at the factory. The wares were expensive, and mostly distributed through the London dealers. Plates were much the most common shapes made, and the decoration was typically of garlands of flowers in a profusion of colours, the speciality of the founder, William Billingsley. With Swansea porcelain,