This book constitutes the refereed proceedings of the 28th International Conference on Information Integration and Web Intelligence, iiWAS 2026, held in Bangkok, Thailand, during December 7–9, 2026.

The 21 full papers, 18 short papers and 2 keynote papers included in this book were carefully reviewed and selected from 85 submissions.

They were organized in topical sections as follows: LLM Behavior, Evaluation & Reliability; Multilingual & Low-Resource Language Processing; Agentic AI & Multi-Agent Systems; Knowledge Graphs, Semantic Data & Process Modeling; Pattern Mining & Efficient Similarity Search; Recommender Systems & AI for Education; Data Quality, Spatio-Temporal & Risk Analytics; and Applied AI Platforms & Multimodal Vision; Decentralized, Federated, Quantum & Web3 Computing.