The Sixth International Workshop on Seawater Sea-sand Concrete (SSC) Structures Reinforced with FRP Composites (6th FRP-SSC Workshop) was successfully held in Hong Kong on 25-26 February 2023. This workshop was co-organized by the Department of Civil and Environmental Engineering and the Research Institute for Sustainable Urban Development of the Hong Kong Polytechnic University. Professor Teng Jin-guang, a chair professor of the Hong Kong Polytechnic University, academician of the Chinese Academy of Sciences, and president of the Hong Kong Polytechnic University, served as the advisory chairman of the workshop organizing committee; Professor Yu Tao served as the chairman of the workshop organizing committee. A series of presentations were given by about 30 invited speakers to share their latest findings in the related area.