The Crawshay family was a prominent Welsh family known for their significant contributions to the iron and coal industries during the 19th century. They played a crucial role in the industrial development of Merthyr Tydfil, a key area for iron production in Wales. The family's wealth and influence grew through their ownership of several ironworks and coal mines. The most notable member of the Crawshay family was William Crawshay II, who expanded the family's business and became one of the richest men in Britain. His leadership helped establish Crawshay's Ironworks, which was renowned for producing high-quality iron products. The family's legacy is closely tied to the industrial history of South Wales.