The International Workshop on Nonmonotonic Reasoning (NMR) is the premier venue for presenting and discussing advances in the area of nonmonotonic reasoning. Since its first edition in 1984, it has brought together researchers from various areas of knowledge representation and reasoning to engage in discussions on the nonmonotonic aspects of their respective fields, including belief revision, uncertain reasoning, reasoning about actions, planning, logic programming, preferences, argumentation, causality, and related topics, as well as systems and applications. This volume contains the informal proceedings of NMR 2025, held on November 11-13, 2025, in Melbourne, Australia. As in past editions, the workshop fostered interaction between diferent subareas of nonmonotonic reasoning while also providing a forum for new and emerging directions. The workshop was structured by topical sessions fitting the scopes of accepted papers. Each NMR 2025 submission was reviewed by at least three programme committee members. Out of 30 submissions, the committee decided to accept 21 papers and 4 extended abstracts (of which one was consequtively withdrawn) for presentation. As a result, 24 papers were presented at the workshop. We are very grateful to Gabriele Kern-Isberner and Antonio Rago for enriching the program with very inspiring invited talks. NMR 2025 was co-located with the 20th International Conference on Principles of Knowledge Representation and Reasoning (KR 2025). We would like to thank the organizers of the KR 2025 conference in Melbourne for their excellent support. We also would like to thank the programme committee members for their help in selecting and improving the submitted papers and all workshop participants for their contributions. Finally, we thank the sponsors of NMR 2025, the Artificial Intelligence Journal and KR Inc. (Principles of Knowledge Representation and Reasoning), for their generous support. We hope that many new inspirations and collaborations between the contributing disciplines will emerge from this workshop.
Local Chair
Programme Committee
and Technische Universität Dortmund, Germany