In this article, we examine concepts that underpin the theories of the policy process. We exemplify the applicability of these concepts in the European policy-making contexts through a systematic scoping review of European applications of the policy entrepreneur. Our findings include that (i) the overwhelming majority of the studies anchored the policy entrepreneur in the Multiple Streams Framework; (ii) more than half of the studies were contextualized at the EU level and in the UK country context; (iii) policy entrepreneurs were identified in a wide range of policy sectors, and (iv) policy entrepreneurs were identified as being individuals as well as organizations but mostly elite actors, often policy-makers. Future avenues for research include policy entrepreneurship in political parties, exploring the interactions of policy entrepreneurs and the role their other identities (public servant, elected official, NGO official, etc.) play in how reactive or proactive they are in seeking opportunities.