This book presents select proceedings of the International Conference on Sustainable Infrastructure: Innovations, Challenges, and Opportunities 2023 (SIIOC 2023). The topics covered include road user safety and traffic mitigation for sustainable highways, transportation geotechnics, design and construction approaches for green highways, water and wastewater treatment, sustainable cities, and challenges in the management of water resources. This book serves as a resource material for budding researchers and industry professionals interested in developing solutions for sustainable infrastructure.