This book constitutes the refereed proceedings of the 8th International Conference on Conceptual Structures, ICCS 2000, held in Darmstadt, Germany in August 2000. The 38 revised full papers presented have been carefully reviewed and selected for inclusion in the proceedings. The book is divided in topical sections on concepts and language, conceptual onthology, conceptual graphs, formal semantics of conceptual structures, contextual logic and formal concept analysis, conceptual structures in practice, and computational aspects of conceptual structures.