When two competitors team up to develop an innovation project, they need to share their knowledge with one another and, at the same time, protect their knowledge from one another. Knowledge management plays a vital role in dealing with this coopetition tension. This chapter discusses extant literature on knowledge management in coopetition and highlights promising directions to advance the field. Amongst others, the need for a more integrative examination of the inter-organizational and intra-organizational dimensions of the phenomenon is emphasized.