This book constitutes the refereed proceedings of the 17th International Conference on Knowledge Engineering and Knowledge Management, EKAW 2010, held in Lisbon, Portugal, in October 2010. The 22 revised full papers and 25 revised short papers presented were carefully reviewed and selected from 166 submissions. The papers are organized in topical sections on knowledge engineering: alignment and identity, knowledge acquisition collaboration in knowledge engineering knowledge engineering: patterns social aspects and tagging semantic web, web of data and linked data ontology evolution and refinement knowledge access annotation, retrieval and natural language processing.