The legacy of conflict in South Eastern Europe has made security sector reform (SSR) an integral part of the region’s transition to stability and democracy. Having been started by the USA and NATO, the initiative to transform the security sector of Serbia was assumed by the EU at the end of the 1990s. The proposed paper will study the SSR in Serbia as an illustration of the multifaceted and complex Europeanisation policies, employed by the EU in the Western Balkans. It will look at what the EU has done in the country’s security sector to bring it closer to the European norms and values, to what extent it took into account the local context, how the EU cooperated with other international actors, present in the region, such as NATO, Russia and Turkey, and whether it prepared the country to take over the ownership of the sector.