This book constitutes the proceedings of the BPM Forum held at the 21st International Conference on Business Process Management, BPM 2023, which took place in Utrecht, The Netherlands, in September 2023.  The Blockchain Forum provided a platform for exploring and discussing innovative ideas on the intersection of BPM and blockchain technology. The RPA Forum focused on the use of the Robotic Process Automation (RPA) in the field of Business Process Management. The Educators Forum brought together educators within the BPM community for sharing resources to improve the practice of teaching BPM-related topics. The 18 full papers included in this volume were carefully reviewed and selected from a total of 39 submissions.