This book constitutes the refereed proceedings of the satellite events held at the 23rd Semantic Web Conference, ESWC 2026, which took place in Dubrovnik, Croatia, during May 10–14, 2026.

The 12 posters and 29 demo papers included in this book were carefully reviewed and selected from 54 submissions; the industry track received 10 submissions of which 5 papers were accepted. In addition, this book contains 18 PhD symposium papers. These deal with up to date research, innovations and fundamental questions related to the semantic web, knowledge graphs, and web data.