This book constitutes the refereed proceedings of the 17th InternationalConference 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 werecarefully reviewed and selected from 166 submissions. The papers areorganized in topical sections on knowledge engineering: alignment andidentity, knowledge acquisition collaboration in knowledge engineeringknowledge engineering: patterns social aspects and tagging semantic web, web of data and linked data ontology evolution and refinement knowledgeaccess annotation, retrieval and natural language processing.