This two-volume set of HCI-Games 2023, constitutes the refereed proceedings of the 5th International Conference on HCI in Games, held as Part of the 24th International Conference, HCI International 2023, which took place in July 2023 in Copenhagen, Denmark. The total of 1578 papers and 396 posters included in the HCII 2023 proceedings volumes was carefully reviewed and selected from 7472 submissions. The HCI in Games 2023 proceedings intends to help, promote and encourage research in this field by providing a forum for interaction and exchanges among researchers, academics, and practitioners in the fields of HCI and games. The Conference addresses HCI principles, methods and tools for better games.