This book constitutes refereed proceedings of the Third International Workshop on Research and Education in Urban History in the Age of Digital Libraries, UHDL 2023, held in Munich, Germany, during March 27-28, 2023. The 15 full papers presented were carefully reviewed and selected from 32 submissions. The papers are organized in the following topical sections: theory, methods, and systematization; data handling and data schemes; machine Learning and artificial Intelligence; visualization and presentation and education.