The Common Security and Defence Policy Service Medal (named the European Security and Defence Policy Service Medal prior to 2009) is an international military decoration awarded to individuals, both military and civilian, who have served with CSDP missions.

Since the 1990s the European Union has taken a greater role in military missions both in Europe and abroad.

These actions were taken under the Common Security and Defence Policy (CSDP), which is implemented by the European Union Military Staff, a department of the EU.

The reverse contains the Latin phrase, Pro Pace Unum, meaning "United for Peace".

The medal is suspended from a 36 mm (1½") ribbon in EU blue with either a wide gold center stripe for headquarters and combat forces, or a wide white stripe for planning and support.