Preface Since 1984, the International Workshop on Nonmonotonic Reasoning (NMR) is the premier venue for presenting and discussing current results in the area of Nonmonotonic Reasoning. It brings together researchers interested in various aspects of knowledge representation and reasoning (KR), including belief revision, uncertain reasoning, reasoning about actions, planning, logic programming, preferences, argumentation, causality, and many other related topics including systems and applications. This volume serves as the informal proceedings of NMR 2024 held on November 2–4, 2024, in Hanoi, Vietnam. The programme of the Workshop featured presentations on a wide range of topics, among them: answer set programming, argumentation theory, belief change, cognitive aspects of nonmonotonic reasoning, and conditional logics. Each submission was thoroughly peer reviewed. We would like to express sincere thanks to the programme committee members for their effort—it not only helped the selection of the best papers, but also improved their quality through the generous feedback offered to the authors. Out of 25 submissions, the committee decided to accept 19 full papers (of which 1 was consecutively withdrawn) and 1 extended abstract. As a result, 19 papers were presented at the Workshop. Moreover, the programme had one session in common with the Joint Workshop on Knowledge Diversity and Cognitive Aspects of KR, which featured two interesting talks. We are very grateful to Richard Booth (Cardiff University, United Kingdom) and Sarah Alice Gaggl (TU Dresden, Germany) for contributing very inspiring invited lectures. NMR 2024 was co-located with the 21st International Conference on Principles of Knowledge Representation and Reasoning (KR 2024). We thank the organizers of the KR 2024 conference for their excellent support. Finally, let us express our gratitude to the generous sponsors of NMR 2024: Artificial Intelligence Journal and KR Inc. (Principles of Knowledge Representation and Reasoning). We hope that this workshop will be inspiring to the participants and that it will foster new collaborations. NMR 2024 Programme Chairs Nina Gierasimczuk Jesse Heyninck NMR 2024 Local Chairs Long Tran-Thanh Thanh Dinh Van Van Dao Hong Hau Nguyen Thi Anh October, 2024 CEUR ceur-ws.org Workshop ISSN 1613-0073 Proceedings Programme Committee Co-Chairs Nina Gierasimczuk Technical University of Denmark, Denmark Jesse Heyninck Open Universiteit, The Netherlands & University of Cape Town, South-Africa Local Organizers Long Tran-Thanh University of Warwick, UK Thanh Dinh Van East Asia University of Technology, Vietnam Van Dao Hong East Asia University of Technology, Vietnam Hau Nguyen Thi Anh East Asia University of Technology, Vietnam Programme Committee Ofer Arieli The Academic College of Tel-Aviv, Israel Mohua Banerjee Indian Institute of Technology Kanpur, India Alexander Bochman Holon Institute of Technology, Israel Richard Booth Cardiff University, United Kingdom Arina Britz Stellenbosch University, South-Africa Giovanni Casini ISTI - CNR, Italy Jake Chandler La Trobe University, Australia Agata Ciabattoni TU Wien, Austria Jens Classen Roskilde University, Denmark Thomas Eiter Vienna University of Technology, Austria Eduardo Fermé Universidade da Madeira, Portugal Sarah Alice Gaggl TU Dresden, Germany Laura Giordano DISIT, Università del Piemonte Orientale, Italy Sujata Gosh Indian Statistical Institute, India Nina Gierasimczuk Technical University of Denmark, Denmark Davide Grossi University of Groningen, The Netherlands Jesse Heyninck Open Universiteit, The Netherlands Andreas Herzig CNRS, IRIT - Universite de Toulouse, France Haythem Ismail German University in Cairo, Egypt Tomi Janhunen Tampere University, Finland Souhila Kaci LIRMM, France Antonis Kakas University of Cyprus, Cyprus Gabriele Kern-Isberner Technische Universität Dortmund, Germany Sébastien Konieczny Université d’Artois, France Karolina Krzyżanowska University of Amsterdam, The Netherlands Isabelle Kuhlmann FerunUniversität in Hagen, Germany Fenrong Liu Tsinghua University, China Thomas Meyer University of Cape Town and CAIR, South Africa Cláudia Nalon University of Brası́lia, Brazil Xavier Parent TU Wien, Austria Simona Perri University of Calabria, Italy Ramon Pino Perez Université d’Artois, France Sylwia Polberg Cardiff University, United Kingdom Nico Potyka Cardiff University, United Kingdom Laurent Perrussel IRIT - Universite de Toulouse, France Anna Rapberger Imperial College London, United Kingdom Ken Satoh National Institute of Informatics and Sokendai, Japan Jandson S. Ribeiro Cardiff University, United Kingdom Kai Sauerwald FernUniversität in Hagen, Germany Guillermo R. Simari Universidad Nacional del Sur, Argentina Sonja Smets University of Amsterdam, The Netherlands Markus Ulbricht TU Dresden, Germany Renata Wassermann University of São Paulo, Brazil Emil Weydert CSC, University of Luxembourg, Luxembourg Stefan Woltran TU Wien, Austria Fan Yang Utrecht University, The Netherlands Jessica Zangari University of Calabria, Italy