Under the Lisbon Treaty, the EU High Representative for Foreign Affairs (HRVP) has obtained far-reaching powers to formulate, coordinate and implement ÉU external policies, traditionally a prerogative of the state. In the exercise of this delegated powers, the HRVP is assisted by a dedicated administrative body, the European External Action Service (EEAS). Formal decision-making over the EU‘s common foreign and security policy lies with the Council, while the European Neighborhood and Trade policies, as well as international cooperation remain competences of the EU-Commission. Concomitantly, the EEAS is situated within several, partly overlapping and conflicting accountability relationships. The ensuing question is: To what extent, how and by whom can the HRVP and the EEAS be held politically to account? With data from official documents, 50 semi-structured interviews and a survey among 184 EU foreign policy-makers, the article maps and assesses of the multi-level actor/forum relationships of the EU's foreign policy machinery.