This book constitutes the refereed proceedings of the 29th International Conference on Theory and Practice of Digital Libraries on Linking Theory and Practice of Digital Libraries, TPDL 2025, held in Tampere, Finland, during September 23–26, 2025.The 14 full papers and 11 finding papers included in this book were carefully reviewed and selected from 103 submissions. The papers are organized in the following topical: Keynotes; Large Language Models; Scholarly Issues; Citation Management; Digital Archives; Digital Humanities and Cultural Heritage; Knowledge Graphs.