Blaenavon Ironworks is an industrial museum in Blaenavon in Wales. The ironworks was of crucial importance in the development of the ability to use cheap, low quality, high sulphur iron ores worldwide. It was the site of the experiments by Sidney Gilchrist Thomas and his cousin Percy Gilchrist that led to "the basic steel process" or "Gilchrist-Thomas process".
It is located close to Blaenavon, in Torfaen, which is a World Heritage Site.