This paper reviews the research on the open innovation process in order to identify critical success factors. The study consists of a systematic review of 29 referred empirical articles on the open innovation process. The studies reviewed highlight different success factors for the open innovation process. These factors are grouped into nine themes: 1) relational aspects, 2) the people involved in the process, 3) governance, 4) facilitators, 5) provision of resources, 6) strategy, 7) process management, 8) leadership and 9) culture. Based upon the findings, the study proposes a number of future research directions that may stimulate more intensive investigation of this field.