William Thaw was an American businessman and philanthropist, known for his contributions to the steel industry in the late 19th and early 20th centuries. He was a key figure in the development of the Pittsburgh area, where he played a significant role in the growth of the Carnegie Steel Company. In addition to his business ventures, Thaw was also involved in various charitable activities. He supported educational institutions and cultural organizations, reflecting his commitment to improving the community. His legacy includes the Thaw Art Gallery at the Carnegie Museum of Art, which showcases his dedication to the arts.