This two-volume set CCIS 3238 and CCIS 3239 constitutes the refereed proceedings of the 13th International Conference on Future Data and Security Engineering, FDSE 2026, held in Ho Chi Minh City, Vietnam, during November 26–27, 2026.

91 full papers, 10 short papers, and 3 invited keynote papers presented in this volume were carefully reviewed and selected from 386 submissions. 

The papers are organized in the following topical sections:

Part I:Invited Keynotes; Advances in Machine Learning; Security and Privacy Engineering; Healthcare and Biomedical AI; Data Analytics and Modern Information Retrieval Techniques; Smart and Sustainable Systems.

Part II: Advances in Machine Learning; Security and Privacy Engineering; Healthcare and Biomedical AI; Data Analytics and Modern Information Retrieval Techniques; Smart and Sustainable Systems; Short Papers: Security and Data Engineering.