This book constitutes the refereed deadline proceedings of the 28th International Conference&nbsp;on&nbsp;Graph-Based Representation and Reasoning, ICCS 2023, held in Berlin, Germany,&nbsp;during&nbsp;September 11-13, 2023.<div><br><div>The 9 full papers, 5 short papers and 4 Posters are included in this book were carefully reviewed and&nbsp;selected from 32 submissions. They were organized in topical sections as follows:&nbsp;Complexity and Database Theory,&nbsp;Formal Concept Analysis: Theoretical Advances,&nbsp;Formal Concept Analysis: Applications,&nbsp;Modelling and Explanation,&nbsp;Semantic Web and Graphs,&nbsp;Posters.</div></div>