Preface The 6th edition of the Workshop on Ontology and Semantic Web Patterns (WOP2015) is a part of the series of workshops addressing the topic of ontology and semantic web patterns as best practices. The workshop acts as a gathering point for the ontology design pattern community for semantic web and linked data. The aim of this workshop is twofold: (i) providing an arena for proposing and discussing good practices, patterns, pattern-based ontologies, systems etc.; and (ii) broadening the pattern community that is developing its own “language” for discussing and describing relevant problems and their solutions. WOP2015 was held in Bethlehem, Pennsylvania, USA, co-located with the 14th International Semantic Web Conference (ISWC2015). In this edition, the workshop hoped to leverage the U.S. GeoVoCamps community whose activity is centered on ontology design pattern modeling for the geosciences and other related application areas, and looked to strengthen the ties with the more tra- ditional pool of participants in WOP, which centers around initiatives such as ontologydesignpatterns.org. WOP2015 was a full-day workshop and its program included an invited talk, paper presentations, poster session, breakout groups and plenary discussion. The invited talk was given by Krzysztof Janowicz and was entitled “Ontology Engi- neering: A View from the Trenches”. Altogether, WOP2015 received 6 research paper submissions and 8 pattern paper submissions. From them, the Program Committee selected 3 research papers, and 7 pattern papers for the presentation at the workshop. All pattern papers were also presented in the poster session. We are very grateful to members of the Program Committee without whom the workshop would not have been possible. We thank our invited speaker, Krzysztof Janowicz, for the inspiring talk. We also thank the organizers of the 14th International Semantic Web Conference for hosting WOP2015 at ISWC 2015. Finally, we thank all participants of the workshop for their lively partici- pation. Further information about WOP2015 can be found at the workshop’s website: http://ontologydesignpatterns.org/wiki/WOP:2015. October 2015 WOP2015 Chairs Eva Blomqvist Pascal Hitzler Adila Krisnadhi Tom Narock Monika Solanki WOP2015 Organization WOP2015 Chairs Eva Blomqvist Linköping University Pascal Hitzler Wright State University Adila Krisnadhi Wright State University & Universitas Indonesia Tom Narock Marymount University Monika Solanki Oxford University WOP2015 Program Committee Alessandro Adamou The Open University Victor de Boer VU Amsterdam David Carral Wright State University Vinay Chaudhri SRI International Michelle Cheatham Wright State University Isabel Cruz University of Illinois at Chicago Enrico Daga The Open University Rim Djedidi LIMICS Laboratory - Paris Nord 13 University Michel Dumontier Stanford University Aldo Gangemi Université Paris 13 & ISTC-CNR Rinke Hoekstra VU Amsterdam Laura Hollink VU Amsterdam Yingjie Hu University of California, Santa Barbara Krzysztof Janowicz University of California, Santa Barbara Jose Emilio Labra Gayo Universidad de Oviedo Agnieszka Lawrynowicz Poznan University of Technology Steffen Lohmann University of Stuttgart Andrea Giovanni Nuzzolese STLab, ISTC-CNR Alesandro Oltramari Carnegie Mellon University Maria Poveda-Villaón Universidad Politécnica de Madrid Valentia Presutti STLab, ISTC-CNR Adam Shepherd Woods Hole Oceanographic Institution Mari Carmen Suárez-Figueroa Universidad Politécnica de Madrid Charles Vardeman University of Notre Dame Boris Villazón-Terrazas iSOCO, Intelligent Software Components