浦项钢铁（朝鲜语：포스코；英语：POSCO；旧英文名：Pohang Iron and Steel Company；又译浦项制铁；KSE：005490；NYSE：PKX；东证1部：5412；LSE：PIDD），是世界上最大的钢铁制造商之一，财富世界500强企业，总部设于韩国庆尚北道浦项市南区。自2010年以来，浦项钢铁已经连续5年7次被评为全球最具竞争力的钢铁制造商。在2015年瑞士达沃斯论坛上浦项钢铁入选全球可持续发展100强企业，名列第36位。

目前浦项钢铁在韩国设有两间炼钢厂，分别在浦项市和光阳市。此外，它也和美国钢铁公司经营着一所合资公司USS-POSCO，总部位于匹兹堡。它拥有K联赛的球队浦项制铁，属于韩国大财阀之一。

POSCO (formerly Pohang Iron and Steel Company) is a multinational steel-making company headquartered in Pohang, South Korea. It had an output of 39.1 million tonnes of crude steel in 2011, making it the world's fourth-largest steelmaker by this measure. In 2010, it was the world's largest steel manufacturing company by market value. Also, in 2012, it was named as the 146th world's largest corporations by the Fortune global 500.