Thisbook constitutes the thoroughly refereed proceedings of the 5th JointInternational Semantic Technology Conference, JIST 2015, held in Yichang,China, in November 2015.The theme of the JIST 2015 conference was "Big Data andSocial Media". The JIST 2015 conference consisted of main technical tracksincluding 2 keynotes, 2 invited talks, a regular technical paper track (fulland short papers), an in-use track, a poster and demo session, workshop, andtutorial.The 14 full and 8 short papers in this volume were carefullyreviewed and selected from 43 submissions. The paper cover the followingtopics: ontology and reasoning, linked data, learning and discovery, RDF andquery, knowledge graph, knowledge integration, query and recommendation, andapplications of semantic technologies.