This book constitutes the refereed proceedings of the 17th IFIP WG 8.5 International Conference on Electronic Participation, ePart 2025, held in Krems, Austria, during August 31–September 4, 2025. The 21 full papers included in this book were carefully reviewed and selected from 116 submissions.The papers were organized in topical sections as follows: Foundations and Frameworks of eParticipation; AI and Algorithmic Systems in Public Administration; Governance, Collaboration, and Policy Alignment; Local Practices, Implementation, and Innovation; Digital Services, Usability, and Citizen Interaction.