Environmental issues are increasing in importance for businesses day by day. Businesses are undergoing an environmentally focused transformation in all their activities within the value chain. Therefore, the necessity of integrating and maintaining the concept of “green” in all processes such as production, technology development, marketing, and supply chains has emerged. Topics such as environmentally sensitive production systems, green supply, and green innovation (GI) are both accepted in practice in various sectors and are examined in the literature. When the impact of green practices on the performance items of businesses is taken into consideration, it is important to examine the issue from this perspective. In this context, the aim of this study is to examine the impact of green supply chain management (GSCM) practices on GI, environmental performance (EP), and competitive advantage (CA). Within the framework of this aim, a survey was conducted on 283 businesses producing plastic, packaging, and textile products in Gaziantep (169) and Konya (114) provinces in Türkiye. In this study, where the quantitative research method was adopted, the hypotheses established were tested by using structural equation modeling (SEM). SPSS 22.0 package program and AMOS 22.0 program were used in the analysis. Within the scope of the analysis, the measurement model (confirmatory factor analysis) was first tested. As a result of the analysis, GSCM practices have a positive impact on GI and CA; GSCM has a positive impact on EP; GI has a positive impact on CA; and EP has not a positive impact on CA. This study is significant as it examines the combined impact of GSCM, GI, EP, and CA. Also, this study is important as it is the first study to examine the impact of GSCM practices on GI, EP, and CA in Türkiye.