The conference on Ontologies, DataBases, and Applications of Semantics for Large Scale Information Systems (ODBASE'15) provides a forum on the use of ontologies and data semantics in novel applications. Of particular relevance to ODBASE 2015 are papers that bridge traditional boundaries between disciplines such as databases, social networks, mobile systems, artificial intelligence, information retrieval, and computational linguistics. We also encourage the submission of research and practical experience papers concerning scalability issues in ontology management, information integration, and information extraction, as well as papers that examine the information needs of various applications. This year, in addition to its traditional focus on the management of semantically rich information, ODBASE 2015 will have special themes captured by specific sessions. We encourage submissions in areas that connect semantics with the entire data flow cycle: from data acquisition e.g. using social networks and mobile devices, data stream processing, e.g., filtering and event contextualization, data analysis, e.g., pattern and knowledge discovery, data visualization, e.g., summary and presentation, to dissemination, e.g., publishing/subscribing.