The European Defence Agency (EDA) is an agency of the European Union (EU) that promotes and facilitates integration between member states within the EU's Common Security and Defence Policy (CSDP). The EDA is headed by the EU High Representative for Foreign Affairs and Security Policy, European Commission’s Vice President (HR/VP), and reports to the Council. The EDA was established on 12 July 2004 and is based in Brussels, Belgium, along with a number of other CSDP bodies.

The Common Security and Defence Policy (CSDP) is the European Union's (EU) course of action in the fields of defence and crisis management, and a main component of the EU's Common Foreign and Security Policy (CFSP).