This volume presents the latest advances, innovations, and applications in the use of FRPs and composite reinforcement for concrete and masonry structures, as presented by leading researchers at the 17th International Symposium on Fiber-Reinforced Polymer (FRP) Reinforcement for Concrete Structures (FRPRCS17), held in Girona, Spain, on July 6-8, 2026. It cover a broad spectrum of topics, including: FRP materials and products, FRP reinforcement for concrete structures, FRP prestressed concrete structures, strengthening of concrete and masonry structures with FRP, effect of extreme events on FRP reinforced/strengthened structures, durability of FRP systems, sustainability and waste management, inspection, monitoring and quality assurance, design codes and guidelines, regulatory assessment, and innovative FRP systems & solutions. Together, they provide a rich source of ideas that not only advance current understanding but also inspire new research directions and foster multidisciplinary collaboration across the field.