S.S. McClure, born Samuel Sidney McClure in 1857, was an influential American publisher and journalist. He co-founded McClure's Magazine in 1893, which became known for its investigative journalism and literary quality. The magazine played a significant role in the rise of muckraking, exposing social issues and corruption in politics and business. McClure's innovative approach to publishing included featuring prominent writers like Ida Tarbell and Lincoln Steffens, who contributed to the magazine's reputation. His work helped shape modern journalism and influenced public opinion during the Progressive Era, making him a key figure in American media history.