The 13th International Conference on HCI in Business, Government and Organizations, HCIBGO 2026, held as part of the 28th International Conference on Human-Computer Interaction, HCI International 2026 (HCII 2026), took place in Montreal, QC, Canada, during July 2026. A total of 7435 individuals from academia, research institutes, industry, and government agencies from 94 countries submitted contributions to HCII 2026. Following peer review, 1463 papers and 360 posters (as short research papers) are included in the volumes of the HCII 2026 proceedings published just before the start of the conference. Two volumes (LNCS 16729 and 16730) of the HCII 2026 proceedings are dedicated to this year’s edition of the HCIBGO conference focusing on topics related to:HCI in Business, Government and Organizations (Part I): AI in Organizations, Decision-Making and Human–AI Collaboration; Digital Transformation, Enterprise Systems and Public Sector Innovation; Human Experience, Well-being and Social Impact of Digital Technologies. HCI in Business, Government and Organizations (Part II): User Experience, and Trust in the Digital Workplace and Business; Digital Commerce, Marketing and Consumer Behavior; Organizational Intelligence for Analysis, Sustainability and Decision Support.