This book constitutes the refereed proceedings of the 13th International Conference on Graph Transformation, ICGT 2020, in Bergen, Norway, in June 2020.*The 16 research papers and 4 tool paper presented in this book were carefully reviewed and selected from 40 submissions.

Theoretical Advances.- Conditional Bigraphs.- Confluence up to Garbage.- Computing embeddings of directed bigraphs.- A Categorical Semantics for Guarded Petri Nets.- Unfolding Symbolic Attributed Graph Grammars.- Single Pushout Rewriting in Comprehensive Systems.- Initial Conflicts for Transformation Rules with Nested Application Conditions.- Patch Graph Rewriting.- Hypergraph basic categorial grammars.- Multilevel Typed Graph Transformations.- Application Domains.- Rewriting Theory for the Life Sciences: A Unifying Framework for CTMC Semantics.- Algebras for tree decomposable graphs.- Graph Parsing as Graph Transformation - Correctness of Predictive Top-Down Parsers.- Graph Consistency as a Graduated Property: Consistency-Sustaining and -Improving Graph Transformations.- Formal Verification of Invariants for Attributed Graph Transformation Systems Based on Nested Attributed Graph Conditions.- Optimistic and Pessimistic On-the- y Analysis for Metric Temporal Graph Logic.- Tool Presentations.- A Flexible and Easy-to-Use Library for the Rapid Development of Graph Tools in Java.- Multiscale graph grammars can generate Cayley graphs of groups and monoids.- The Glasgow Subgraph Solver: Using Constraint Programming to Tackle Hard Subgraph Isomorphism Problem Variants.- A Simulator for Probabilistic Timed Graph Transformation Systems with Complex Large-Scale Topologies.

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