Who regulates US workplace safety?

There is no one agency in the US that regulates all of workplace safety.

The Occupational Safety and Health Administration (and about 26 equivalent organizations in State Plan States) issues safety and health standards for the Long Shoring Industry, the Construction Industry, and General Industry. The Mine Safety and Health Administration regulates metal and non-metal mining. The Coast Guard regulates the safety of working conditions on vessels at sea and in port. The Nuclear Regulatory Commission regulates nuclear workplace safety. Certain Federal and State government agencies are responsible for regulating the safety within their own workplaces.