This nine-volume set LNCS 16758-16766 constitutes the papers of several workshops which were held in conjunction with the 26th International Conference on Computational Science and its Applications, ICCSA 2026, held in Braga, Portugal, during June 30 - July 3, 2026.The 328 full papers, 23 short papers and 3 PhD showcase papers included in these volumes were carefully reviewed and selected from 1184 submissions.The conference consisted of 57 workshops, focusing on topical issues of utmost importance to science, technology and society: from new computational approaches for earth science, to mathematical methods for image processing, new statistical and optimisation methods, several Artificial Intelligence approaches, sustainability issues, smart cities and related technologies.