This book constitutes the refereed proceedings of the 14th International Conference on Graph Transformation, ICGT 2021, which took place virtually during June 24-25, 2021.The 14 full papers and 2 tool papers presented in this book were carefully reviewed and selected from 26 submissions. and tool presentations.

Theoretical Advances.- Concurrency Theorems for Non-linear Rewriting Theories.- A Generalized Concurrent Rule Construction for Double-Pushout Rewriting.- Transformations of Reaction Systems over Categories by means of Epi-Mono Factorization and Functors.- Graph Rewriting and Relabeling with PBPO+.- Incorrectness Logic for Graph Programs.- Powerful and NP-Complete: Hypergraph Lambek Grammars.- Evaluation Diversity for Graph Conditions.- Application Domains.- Host-Graph-Sensitive RETE Nets for Incremental Graph Pattern Matching.- Rule-Based Top-Down Parsing for Acyclic Contextual Hyperedge Replacement Grammars.- Nets with Mana: A Framework for Chemical Reaction Modelling.- A Case Study on the Graph-transformational Modeling and Analysis of Puzzles.- Interval Probabilistic Timed Graph Transformation Systems.- Verifying Graph Programs with Monadic Second-Order Logic.- On the Complexity of Simulating Probabilistic Timed Graph Transformation Systems.- Tool Presentations.- Automated Checking and Completion of Backward Confluence for Hyperedge Replacement Grammars.- GrapePress - A Computational Notebook for Graph Transformations.

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