2020 4th International Conference on Green Composite Materials and Nanotechnology (GCMN 2020) will be held during November 26-28, 2020 in Chongqing, China. A key aspect of this conference is the strong mixture of academia and industry. This allows for the free exchange of ideas and challenges faced by these two key stakeholders and encourage future collaboration between members of these groups. GCMN 2020 is to bring together innovative academics and industrial experts in the field of Green Composite Materials and Nanotechnology to a common forum. The primary goal of the conference is to promote research and developmental activities in Green Composite Materials and Nanotechnology and another goal is to promote scientific information interchange between researchers, developers, engineers, students, and practitioners working all around the world.