This book constitutes the refereed proceedings of the 27th International Conference on Asia-Pacific Digital Libraries, ICADL 2025, held in Metro Manila, Philippines, during December 3-5, 2025. The 12 full papers, 26 short papers, 5 demo/poster papers, and 3 practice papers presented in this volume were carefully reviewed and selected from 102 submissions. They were categorized under the following topical sections: Large Language Models and Generative AI; Digital Libraries, Archives, and Metadata; Scholarly Communication, Open Science, and Research Data; Information Behavior, Literacy, and HCI; Information Rights, Privacy, and Data Management; Emerging Technologies in Knowledge Organization and Description, and the Future of Cultural Heritage; Ethics, Social Divides, and Lived Experiences; Archival Education, Models, and Practices.