Since the 1990s, the European Union (EU) has renewed its support for regional integration in other parts of the world, and incorporated this objective as a part of European external policy. Compared to the embryonic common foreign and security policy (CFSP), the support for regional integration and co-operation has been much less controversial, having been publicly endorsed by European Commission officials, and identified in the policy publications emanating from the various Directorate Generals (DGs). This article adopts a policy learning perspective to investigate this departure in external policy by the EU, and to identify the explanatory capacity of collective learning for the core beliefs, preferences, and policy instruments eventually adopted by European policy-makers. The article identifies what types of learning have taken place, and assesses the impact of learning on the policy outputs and outcomes.