This book gathers a collection of selected works and new research results of scholars and graduate students presented at the 9th International Conference on Artificial Intelligence and Virtual Reality (AIVR 2025) held in Osaka, Japan during July 11-13, 2025. The focus of the book is interdisciplinary in nature and includes research on all aspects of artificial intelligence and virtual reality, from fundamental development to the applied system. The book covers topics such as system techniques, performance, and implementation; content creation and modelling; cognitive aspects, perception, user behaviour; AI technologies; interactions, interactive and responsive environments; AI/VR applications and case studies.