The two-volume set LNCS 15493 and LNCS 15494 constitutes the refereed proceedings of the 26th International Conference on Asia-Pacific Digital Libraries, ICADL 2024, held in Bandar Sunway, Malaysia, during December 4-6, 2024. The 19 full papers, 10 short papers, 7 posters and 2 practice papers presented were carefully reviewed and selected from 110 submissions. These papers are included in both volumes of the proceedings, grouped according to the following topics: Cultural Data Analysis, Design & Evaluation, Generative AI & Digital Libraries, Information Retrieval, Information Seeking & Use (Part I) and Knowledge Extraction, Scholarly Information Processing, and Social Media Analytics in Part II.