This two-volume set LNCS 16367 -16368 constitutes the proceedings of the 26th International Conference on Web Information Systems Engineering, WISE 2025, held in Marrakech, Morocco, in December 15–17, 2025.The 54 full papers and 22 short papers were presented in these proceedings were carefully reviewed and selected from 140 submissions. The papers have been organized in the following topical sections as follows:Recommender Systems II; Recommender Systems III; Route Optimisation and Networks; Large Language Models II; Knowledge Graphs II; Information Retrieval and Keywords; Graph Models and Methods; Human-Centred Applications and Services; Distributed Data and Code Generation.