This book presents selected papers from 2025 12th International Conference on Geological and Civil Engineering, held in Sapporo, Japan, March 7-9, 2025. The event aims to provide opportunities for the delegates to exchange new ideas and application experiences face to face, to establish business or research relations, and to find global partners for future collaboration. The recent developments in the area of geological and civil engineering are briefly discussed. The topics covered in this book include seismic response and liquefaction modeling, pavement materials and roadway stabilization, advanced design, optimization, and evaluation for concrete and structural systems, intelligent sensing and data-driven solutions for civil infrastructure. The book will be useful for researchers and scholars who are working in the field of geological and civil engineering.