Powell Duffryn is a United Kingdom coal mining, ports and engineering company. It dug its first coal mine in South Wales in 1840, and after that many other coal mines, and later expanded into various sorts of manufacturing. After its coal mines were nationalised (and subsequently operated by the National Coal Board), the company continued to operate as a ports and engineering firm. It was acquired in 2000 by Nikko Principal Investments Japan Ltd., a unit of Nikko Cordial Corp. of Japan.