This book constitutes the refereed proceedings of 7 workshops, held at the 42nd International Conference on Conceptual Modeling, ER 2023, held in Lisbon, Portugal, during November 6-9, 2023.The 28 full and 2 short papers were carefully reviewed and selected out of 53 submissions. Topics of interest span the entire spectrum of conceptual modeling, including research and practice in areas such as theories of concepts and ontologies, techniques for transforming conceptual models into effective implementations, and methods and tools for developing and communicating conceptual models. The following workshops are included in this volume:CMLS - 4th International Workshop on Conceptual Modeling for Life Sciences;CMOMM4FAIR - Third Workshop on Conceptual Modeling, Ontologies and (Meta)data Management for Findable, Accessible, Interoperable, and Reusable (FAIR) Data;EmpER - 6th International Workshop on Empirical Methodsin Conceptual Modeling;JUSMOD - Second International Workshop on Digital Justice, Digital Law and Conceptual Modeling;OntoCom - 9th International Workshop on Ontologies and Conceptual Modeling;QUAMES - 4th International Workshop on Quality and Measurement of Model-Driven Software Development;SmartFood - First Workshop on Controlled Vocabularies and Data Platforms for Smart Food Systems.