United States Steel Corporation, more commonly known as U.S. Steel, is an American integrated steel producer headquartered in Pittsburgh, Pennsylvania, with production operations primarily in the United States of America and in several countries across Central Europe. It was the 8th largest steel producer in the world in 2008. By 2018, the company was the world's 38th-largest steel producer and the second-largest in America behind Nucor Corporation.

Though renamed USX Corporation in 1986, the company was renamed United States Steel in 2001 after spinning off its energy business, including Marathon Oil, and other assets from its core steel concern.

The Steel Workers Organizing Committee (SWOC) was one of two precursor labor organizations to the United Steelworkers. It was formed by the CIO (Committee for Industrial Organization) on June 7, 1936. It disbanded in 1942 to become the United Steel Workers of America. The Steel Labor was the official paper of SWOC.