The importance of emotions has increasingly been recognized in the information systems field. Emotions do not only influence the human mind, but can also be transferred to others through knowledge. This transfer of knowledge is part of the broader organizational concept of knowledge management (KM) and requires the attention of researchers interested in emotions and emotion theories. Therefore, our paper presents a systematic review of existing evidence on the emotions’ role in KM research. Our review shows that despite KM’s long tradition, there is only limited evidence as to how emotions are related to KM, most of which mention emotions as motivation for KM. As a result of our study, we identify four research opportunities to further examine certain aspects of emotions’ role in KM.