With environmental regulations taking effect worldwide, Green Supply Chain Management (GSCM) has risen to prominence due to its emphasis on tackling complex environmental processes while improving the bottom line performance. Since GSCM involves transferring green knowledge and standardising production and delivery processes, the success of joint efforts among supply chain partners hinges on how tightly the trust relationship with partners is woven. This study, based on 125 companies from South Korea, shows that GSCM orientation positively influences firm performance via supply chain partners’ trust and information sharing. This research suggests the significance of solid trust relationship among supply chain partners in the course of implementing and pursuing GSCM.