This book constitutes the refereed proceedings of the 13th International Conference on Analysis of Images, Social Networks and Texts, AIST 2026, held in Astana, Kazakhstan, during October 16-18, 2026.The 29 full papers and 1 short paper included in this volume were carefully reviewed and selected from 115 submissions. They are organized into the following topical sections: Natural Language Processing; Computer Vision; Data Analysis and Machine Learning; and Network Analysis.