The Registry for Section I and Section II of the Criminal and Appellate Divisions is managed by a Registrar who is responsible, in cooperation with the President of the Court, for the administration and provision of administrative, legal and other support services to Section I and Section II of the Criminal and Appellate Divisions.

The Registry has the following organizational units:

1. Administration – responsible for providing administrative support to the work of Section I and Section II, including IT services, translation services and other practical support.
2. Legal Department – under the direct supervision of the President of the Court, it provides legal support to judges and panels of Section I and Section II in carrying out their duties under the law.
3. Court Management Section – manages the daily activities to ensure a smooth operation of the Court.
4. Public Information and Outreach Section – responsible for the contacts of the Court with the media and any other external contact of public nature.
5. Witness Support Section – provides practical and, when necessary, psychological support to witnesses during testimony before the Court.
6. ICT Department - management, maintenance and improvement of the information and telecommunication systems in order to provide safe and reliable working conditions.
7. Internal Control Section