As well as review the literature on the notion of institutional entrepreneurship introduced by Paul DiMaggio in 1988, we propose a model of the process of institutional entrepreneurship. We first present theoretical and definitional issues associated with the concept and propose a conceptual account of institutional entrepreneurship that helps to accommodate them. We then present the different phases of the process of institutional entrepreneurship from the emergence of institutional entrepreneurs to their implementation of change. Finally, we highlight future directions for research on institutional entrepreneurship, and conclude with a discussion of its role in strengthening institutional theory as well as, more broadly, the field of organization studies.