The increasing environmental concerns and the growing demand of consumers for eco-friendly products have driven companies to adopt green supply chain management practices. In this context, it has become crucial for companies to consider environmental criteria in their supplier selection processes. The aim of this study is to evaluate the suppliers of a ready-mixed concrete company within the framework of green supplier selection criteria. In the study, firstly, the weights of the supplier selection criteria were determined using the Entropy and CRITIC methods. According to the results, the "Quality" criterion emerged as the most important, while the "Green Image" criterion was identified as the least important. Among the sub-dimensions of the quality criterion, product quality, conformity to standards, and quality assurance systems are prominent. Subsequently, the VIKOR method was applied, and supplier A5 was determined as the most suitable green supplier. The results of the study indicate that the company should emphasize environmentally friendly practices in its production processes and that it would be appropriate to collaborate with supplier A5 in this direction. Furthermore, quality is emphasized as the most important criterion in green supplier selection. As this is the first study in the literature that uses Entropy, CRITIC, and VIKOR methods together in solving green supply chain management decision problems, this research is expected to make a significant contribution to the literature.