Irish Steel Limited (Irish: Cruach na hÉireann Teoranta), later known as Irish Ispat Limited, was an Irish semi-state company which was involved in steel production primarily from a plant on Haulbowline island in Cork Harbour. Originally founded in 1939, the company and its assets were sold to Ispat International (later known as Mittal Steel Company) (for IR£1) in 1996. The company and its plant closed down in 2001.
Dumping of production materials, including toxic waste, resulted in significant contamination of the Irish Steel plant site, and increased the size of Haulbowline island by 9 hectares (22 acres). Campaigners, including Erin Brockovich, pushed for action by the state, and €61m was allocated to clean-up the site and to redevelop it as a park. The cleanup and redevelopment project lasted upwards of a decade; from 2011 to 2021.