The Horsehead Holding Corporation, formerly The New Jersey Zinc Company, was an American producer of zinc and related materials based in Pittsburgh. The operations of the historic company are currently conducted as American Zinc Recycling.

The New Jersey Zinc Company was for many years the largest producer of zinc and zinc products in the United States. The company thrived in the period from 1897 to 1966, at which time it merged with Gulf and Western Industries. It continued to operate as a subsidiary of Gulf+Western until 1981, when a management-led buyout acquired it under the name of Horsehead Industries. The New Jersey Zinc Company remained a subsidiary of Horsehead Industries until 1987, when Horsehead merged it with St. Joe Minerals a Missouri lead and zinc producer to form Zinc Corporation of America. The company suffered from worldwide record low prices for zinc in the early 2000s and filed for Chapter 11 bankruptcy in 2002. Sun Capital Partners purchased the company's assets in 2003 for $73.6 million and renamed it Horsehead Corporation which currently produces zinc products processed from recycling and steelmaking waste.

Horsehead filed for voluntary Chapter 11 bankruptcy protection on Feb 2, 2016.