This book constitutes the proceedings of the 15th IFIP WG 8.5 International Conference on Electronic Participation, ePart 2023, held in Budapest, Hungary, in September 2023, in conjunction with the IFIP WG 8.5 Conference on Electronic Government (EGOV 2023) and the Conference for E-Democracy and Open Government Conference (CeDEM 2023).

E-Participation.- The case for a broader approach to e-participation research: Hybridity, isolation and system orientation.- Identifying institutional, contextual and dimension-based patterns in public strategic planning processes.- Participatory Budgeting in Budapest: Navigating the Trade-offs of Digitalisation, Resilience, and Inclusiveness Amid Crisis.- Residents' voices on proposals: Analysing a participatory budgeting project in Seoul using topic modelling.- Digital Transformation.- Barriers to the Introduction of Artificial Intelligence to Support Communication Experts in Media and the Public Sector to Combat Fake News and Misinformation.- Structuring Continuous Education Offers for E-Government-Competence Acquisition: A Morphological Box.- Institutional re-design for a digital era - learning from cases of automation.- Digital Technology.- How Search Engines See European Women.- From Integration to Data Sharing - How Developers Subvert the Public Sector.- Digital Sovereignty.- Shaping a Data Commoning Polity: Prospects and Challenges of a European Digital Sovereignty.