Information is quite scanty on the drone situation in Serbia, but the Serbia Civil Aviation Directorate considers them to be legal.
The regulations around drones in Serbia kicked in on February 20, 2020. The regulations cover the safe use of unmanned aircraft, how they are classified, requirements around recording, their maintenance, and several other factors.
Here are the contact details for any inquiries:
Tel: +381 112927169
Additional information on permit applications and the process requirements is here
Anyone can buy a drone but the license to fly one is determined by the Directorate of Civil Aviation. You must be medically fit and a licensed aircraft operator.
In addition, one must have: