While the use of patterns in computer science is well established, research into ontology design patterns is a fairly recent development. We believe that it is important to develop an overview of the state of research in this new field, in order to stake out possibilities for future research and in order to provide an introduction for researchers new to the topic. This paper presents a systematic literature review of all papers published at the three large semantic web conferences and their associated workshops in the last five years. Our findings indicate among other things that a lot of papers in this field are lacking in empirical validation, that ontology design patterns tend to be one of the main focuses of papers that mention them, and that although research on using patterns is being performed, studying patterns as artifacts of their own is less common.