This book gathers the latest advances, innovations, and applications in the field of sustainable territorial development of the Arctic, as presented by international researchers and engineers at the International Scientific Conference Arctic Territorial Development: Challenges & Solutions (ARCTD), held in St. Petersburg, Russia, on September 29-30, 2021. It covers highly diverse topics, including architecture and urban planning in the Far North, engineering, construction and operation of buildings, utilities and transport infrastructure, development and application of energy-saving materials and technologies for construction, fuel and energy complex and utility services, improving the durability and operational reliability of technological machines, economic potential for sustainable development of the Arctic territories. The contributions, which were selected by means of a rigorous international peer-review process, highlight numerous exciting ideas that will spur novel researchdirections and foster multidisciplinary collaborations.