The three-volume set LNCS constitutes the refereed proceedings of the 10th International Joint Conference on Web and Big Data, APWeb-WAIM 2026, held in Da Nang, Vietnam, during September 7-9, 2026.The 108 regular research papers, 24 special track papers, 1 industry paper, and 9 demo papers presented in these proceedings were carefully reviewed and selected from 309 submissions. The papers are organized in the following topical sections:Part I: Advanced Architectures, Database Engineering, Enterprise and Education Applications, Prediction, LLM and NLP, Recommendation Systems, Query Processing, Security and Privacy, Semantic IssuesPart II: LLM and NLP, Recommendation Systems,Tree-enabled Processing, Community-based Issues, Knowledge Graphs, LLM and NLP, Neural Networks and Learning, Crowdsourcing, Time Series, Machine LearningPart III: Neural Networks and Learning, Traffic Management, Neural Networks and Learning, Trajectory Management, Video and Image Processing, Special Track, Special Track, Special Track, Special Track, Special and Industrial Tracks, Demo Track