This book constitutes revised selected papers of the 13th International Symposium on From Data Models and Back, DataMod 2025, held in Toledo, Spain, during November 10–11, 2025.The 7 full papers and 1 sort paper included in this book were carefully reviewed and selected from 12 submissions. These papers present research results in the floowing areas:Modelling methodologies of interest include automata, agents, Petri nets, process algebras and rewriting systems.Application domains include social systems, ecology, biology, medicine, smart cities, governance, security, education, software engineering, and any other field that deals with complex systems and large amounts of data.
