Recent work on health system strengthening suggests that a combination of leadership and policy capacity is essential to achieve transformation and improvement. Policy capacity and leadership are mutually constitutive but difficult to assemble in a coherent and consistent way. Our paper relies on the nested model of policy capacity to empirically explore how health reformers in seven Canadian provinces address the question of policy capacity. More specifically, we look at emerging representations of policy capacity within the context of health reforms between 1990 and 2020. Based on the exploration of the scientific and grey literature (legislation, annual reports of Ministries, agencies and organizations, meeting minutes, press, etc.) and interviews with key informants (n = 54), we identify how policy capacity is considered and framed within health reforms A series of core dilemmas emerge from attempts by each province to develop policy capacity for and through health reforms.