Preface The ISWC Doctoral Consortium (ISWC-DC) is held in conjunction with the In- ternational Semantic Web Conference and provides Ph.D. students working on the Semantic Web area the opportunity to share and discuss their research prob- lems in a critical but supportive environment. ISWC-DC is open to submissions of students at different stages of a Ph.D. program. Evaluation of the submissions is conducted according to the student level into the Ph.D. program. This volume contains doctoral proposals accepted at ISWC-DC 2015, which was held in Bethlenhem, Pennsylvania on October 12th 2015. The call for papers of the ISWC-DC 2015 edition was open for three types of proposals: Early Stage, Middle Stage, and Final Stage Ph.D. students. All the proposals included in this volume went through a peer-review process that resulted out in the acceptance of 12 out of 24 submissions. All the accepted submissions were evaluated by three international senior reseachers in terms of: Motivation and Relevance of the Proposed Research; Analysis of the State-of-the-Art; Novelty of the Pro- posed Approach; Relevance of the Initial Results; Feasibility of the Empirical Evaluation Methodology; Analysis of Lessons Learned, Open Issues, and Fu- ture Directions; and Clarity and Presentation. Additionally, all the papers and their corresponding evaluations were meta-reviewed by two additional senior researchers. Comments of the reviewers and meta-reviewers were taken into ac- count by the authors and included in the camera ready versions of the accepted papers. Accepted doctoral proposals cover Linked Data management techniques, Linked Data mining, and Knowledge Discovery. For what we are proud to call a very exciting scientific event, we would like to warmly thank, in no particular order: the authors of the papers, the Program Committee, the ISWC Local Chairs and General Chair, and the supporting institutions. Furthermore, we thank Easy- Chair for providing the tools to create this proceedings. Without the effort of all the above, the ISWC-DC 2015 could not have been successful. October, 2015 Fabio Ciravegna Bethlenhem Maria-Esther Vidal Program Committee Harith Alani KMi, The Open University Fabio Ciravegna University of Sheffield Oscar Corcho Universidad Politécnica de Madrid Philippe Cudre-Mauroux U. of Fribourg Claudia Damato Università degli Studi di Bari Fabien Gandon Inria Siegfried Handschuh Pascal Hitzler Wright State University Lalana Kagal MIT Diana Maynard University of Sheffield Enrico Motta Knowledge Media Institute, The Open University Natasha Noy Google Axel Polleres Vienna University of Economics and Business - WU Wien Guus Schreiber VU University Amsterdam Elena Simperl University of Southampton Maria Esther Vidal Universidad Simon Bolivar, Dept. Computer Science Ziqi Zhang University of Sheffield