In European External Action Service, Mauro Gatti provides a legal analysis of the EU’s ‘foreign ministry’. The European External Action Service (EEAS) was created to coordinate the supranational and intergovernmental areas of EU external relations, but it is unclear whether and how it may attain this objective. Through an analysis of law and practice, Gatti demonstrates that the EEAS is capable of effectively promoting coherence in EU external relations. Although working independently from EU institutions and Member States, the EEAS can coordinate their activities at an administrative level. The EEAS is thus ideally placed to bring together EU external action instruments, including diplomatic efforts, development cooperation, and security policies.