The 3-volume set, LNCS 16767, 16768, 16769, constitutes the refereed proceedings of the 26th International Conference on Computational Science and Its Applications – ICCSA 2026, held in Braga, Portugal, during June 30–July 3, 2026.

The 116 full papers, 3 short papers, and 2 PHD showcase paper were carefully reviewed and selected from 405 submissions. The papers have been organized in topical sections as follows:

Part 1 : Computational Methods, Algorithms and Scientific Applications; High Performance Computing and
Networks; Geometric Modeling, Graphics and Visualization; Advanced and Emerging Applications.
Part 2 : Information Systems and Technologies; 
Part 3 : Information Systems and Technologies; Urban and Regional Planning; PHD Showcase Papers; Short Papers.