This book constitutes the proceedings of the 26th International Conference of Web Engineering, ICWE 2026, held in Lyon, France, during June 9-12, 2026.

ICWE 2026 received a total of 75 submissions. From these 11 full papers, 4 NIER papers and 3 short papers as well as 8 PhD symposium papers, 12 demo and poster papers and 1 tutorial paper were selected for inclusion in this book. These papers focus on following topical sections: Research and Industrial Tracks; New Ideas and Emerging Results (NIER); PhD Symposium; Demos and Posters; Tutorials.