The substantial growth in the quantity, diversity and complexity of linguistic data accessible on the Web has led to many new and interesting research areas in Natural Language Processing (NLP) and linguistics. However, resource interoperability represents a major challenge that still needs to be addressed, in particular if information from different sources is combined. With its fourth instantiation, the Linked Data in Linguistics workshop continues to provide a major forum to discuss the creation of linguistic resources on the web using linked data principles, as well as issues of interoperability, distribution protocols, access and integration of language resources and natural language processing pipelines developed on this basis. As a result of the preceding workshops, a considerable number of resources is now available in the Linguistic Linked Open Data (LLOD) cloud. LDL-2015 will thus specifically welcome papers addressing the usage aspect of Linked Data and related technologies in NLP, linguistics and neighboring fields, such as Digital Humanities. Organized by the interdisciplinary Open Linguistics Working Group, the LDL workshop series is open to researchers from a wide range of disciplines, including (computational) linguistics and NLP, but also the Semantic Web, linguistic typology, corpus linguistics, terminology and lexicography. In 2015, we plan to increase the involvement of the LIDER project and the LD4LT community group, to build on their efforts to facilitate the use of linked data and language resources for commercial applications, and to continue the success of LIDER‘s roadmapping workshop series in engagement with enterprise.