This two-volume set constitutes the refereed proceedings of the 17th International Conference on Universal Access in Human-Computer Interaction, UAHCI 2023, held as part of the 25th International Conference, HCI International 2023, in Copenhagen, Denmark, during July 23-28, 2023. The total of 1578 papers and 396 posters included in the HCII 2022 proceedings was carefully reviewed and selected from 7472 submissions. The UAHCI 2023 proceedings were organized in the following topical sections: Part I: Design for All Methods, Tools and Practice; Interaction Techniques, Platforms and Metaphors for Universal Access; Understanding the Universal Access User Experience; and Designing for Children with Autism Spectrum Disorders.  Part II: Universal Access to XR; Universal Access to Learning and Education; Assistive Environments and Quality of Life Technologies.