The object of policy research is the understanding of the interaction among the machinery of the state, political actors, and the public. To facilitate this understanding, a number of complementary theories have developed in the course of more than two decades. This article reviews recent scholarship on the established theories of the policy process, mostly published in 2011 and 2012. Additionally, scholarship extending these theories is identified and new theories of policy process are discussed. This review finds that the established theories have generated substantive scholarship during the period under review and have also been the springboard for much of the recent thinking in policy research.