In this chapter we focus on participation in open strategy. We examine how the issue of participation has been dealt with in previous strategy literature and elaborate on how research on open strategy can be linked with and advance this body of work. We identify three main views on participation in strategy research: participation as an inherent part of the strategy process, participation as enabled or constrained by practices, and participation as an issue of subjectivity. We then elaborate three distinctively different approaches to participation that might inform our understanding of inclusion in open strategy: open strategy as limited participation, open strategy as co-creation of strategies, and open strategy as 'deep engagement' defining the rules of the game. Based on these approaches, we discuss their implications on open strategy research and suggest a research agenda for future studies of participation in open strategy.