This three-volume set, LNCS 15788-15790, constitutes the refereed proceedings of the 17th International Conference on Virtual, Augmented and Mixed Reality, VAMR 2025, held as part of the 27th International Conference on Human-Computer Interaction, HCII 2025, in Gothenburg, Sweden, during June 22&27, 2025.The total of 1430 papers and 355 posters included in the HCII 2025 proceedings were carefully reviewed and selected from 7972 submissions.The papers presented in these three volumes are organized in the following topical sections:: Part I: Designing and Developing Virtual Environments; UX in Virtual EnvironmentsPart II: VR, Culture, Art and Entertainment; Social Interaction and Wellbeing in Virtual EnvironmentsPart III: VR Games; Virtual Environments for Learning, Training and Professional Development; Multimodal Interaction in Virtual Environments