Sustainability is fundamental to complete development since it minimizes the negative impacts of work that is beneficial to society. Some sectors, such as the Iron and Steel Industry (ISI), have served the development of humanity for centuries and have enabled humanity to create new tools and build solid structures. ISI is a main material provider for different industries such as household appliances, car production, building, and medical devices. The importance of iron and steel for humanity is obvious and the sector serves humanity for being an advanced civilization. On the other hand, iron and steel production requires complex production methods, high energy consumption, and toxic materials. An industry that is so important for the development of civilization harms the planet that we all live in and threatens all living creatures when it doesn’t have environmental consciousness. The iron and steel sector should make its production model more environmentally friendly. In this context, this study aims to explore the effects of Green Supply Chain Management practices on 3 performance aspects (environmental, operational, and economic) of Turkish ISI. Findings indicate that every single GSCM practices have a different level of positive impact on environmental and operational performance. However, the findings suggest that the effects of GSCM practices on economic performance are not enough to declare a positive relationship because it is not obvious and highly clear as environmental performance and operational performance.