John Cockerill & Cie. was a Belgian iron, steel, and manufacturing company based at Seraing in the province of Liège. It was founded in 1825 by English-born industrialist John Cockerill. John Cockerill, a son of British entrepreneur William Cockerill, owned the company, and it was known as John Cockerill & Cie. However, John Cockerill died in Warsaw in 1840 after a business trip to Russia. Following his death, the company became state owned, and in 1842, it became known as the Société anonyme pour l'exploitation des établissements de John Cockerill.