The four-volume set LNCS 14011, 14012, 14013, and 14014 constitutes the refereed proceedings of the Human Computer Interaction thematic area of the 25th International Conference on Human-Computer Interaction, HCII 2023, which took place in Copenhagen, Denmark, in July 2023.   A total of 1578 papers and 396 posters have been accepted for publication in the HCII 2023 proceedings from a total of 7472 submissions. The papers included in the HCI 2023 volume set were organized in topical sections as follows:   Part I: Design and evaluation methods, techniques and tools; interaction methods and techniques;   Part II: Children computer interaction; emotions in HCI; and understanding the user experience;   Part III: Human robot interaction; chatbots and voice-based interaction; interacting in the metaverse;   Part IV: Supporting health, quality of life and everyday activities; HCI for learning, culture, creativity and societal impact.