The book "Conceptual Modeling" documents the refereed proceedings of the 345th International Conference on Conceptual Modeling, which took place in November 2016 in Gifu, Japan. It includes a carefully curated selection of 23 full papers and 18 short contributions, chosen from a total of 113 submissions. The contributions are organized into various thematic sections that address current developments and challenges in the field of conceptual modeling. Topics covered include analytics, ontologies, requirements, advanced conceptual modeling, as well as the modeling and execution of business processes. The conference papers provide valuable insights into the latest research findings and applications of conceptual modeling, targeting professionals and researchers in this field.