The "HCI International 2024 Posters" are a comprehensive collection of extended abstracts presented at the 26th International Conference on Human-Computer Interaction (HCII 2024). This seven-volume series includes a total of 1,271 scientific papers and 309 posters, carefully selected from over 5,100 submitted contributions. The conference took place from June 29 to July 4, 2024, in Washington, DC, and offers deep insights into current research topics and developments in the field of human-computer interaction. The posters are divided into various thematic sections that cover a wide range of aspects of HCI, from design methods to inclusive applications, as well as the latest trends in interaction with artificial intelligence and virtual environments. This collection serves as a valuable reference for professionals, researchers, and students engaged with the latest findings and technologies in the field of HCI.