This book is a collection of selected papers presented at 2025 3rd International Conference on Advanced Unmanned Aerial Systems, held on October 24 26, 2025 in Songshan Lake, Guangdong, China. It presents cutting-edge original research within Unmanned Aerial Systems (UAS) fields and the boundless opportunities they offer. Encompassing various facets of the UAS domain, the topics discussed include UAS Autonomous Decision-Making, Artificial Intelligence, Task Planning and Environmental Perception, Flight Performance and Propulsion Systems, Communication and Security, Space and Aerospace Applications. The book is tailored for researchers, engineers, and practitioners deeply involved in the field of UAS, as it provides in-depth insights and thorough discussions on its foundational principles, making it a valuable reference for those deeply engaged in UAS research and development.