this book constitutes the refereed proceedings of the 10th international conference on conceptual structures, iccs 2002, held in borovets, bulgaria. in july 2002.the 27 revised full papers presented together with two invited contributions were carefully reviewed and selected for inclusion in the book. the papers are organized in topical sections on data and knowledge structures, information retrieval, natural language, ontology and semantics, interfaces and applications, and logical and mathematical foundations.