The United Nations Detention Unit (UNDU) is a UN-administered jail. It is part of the Hague Penitentiary Institution's Scheveningen location, more popularly known as Scheveningen Prison, in The Hague, Netherlands. The UNDU was established in 1993 as part of the International Criminal Tribunal for the former Yugoslavia (ICTY) and currently houses detainees whose cases have been taken over by the International Residual Mechanism for Criminal Tribunals (IRMCT).

Radovan Karadžić is a Bosnian Serb politician who was convicted of genocide, crimes against humanity and war crimes by the International Criminal Tribunal for the former Yugoslavia (ICTY). He was the president of Republika Srpska during the Bosnian War.