This book gathers peer-reviewed contributions presented at the 6th International Conference “Innovative Materials, Structures and Technologies” (IMST), held in Riga, Latvia on September 10–12,  2025. The contributions address topics such as the analysis and design of advanced structures and buildings; innovative, ecological and energy efficient building materials; development of inspection and monitoring methods; structural management; alkali activated materials & geopolymers; high performance cement composites; 3D printing of building materials; building materials with reduced environmental impact; structural engineering; structural health monitoring; composite materials and structures; nZEB and indoor environmental quality; circular economy for building sector.