The United Nations Office for Disarmament Affairs is publishing this paper on the occasion of the thirtieth anniversary of the United Nations Register of Conventional Arms. It aims to provide guidance in support of Member State participation in the Register. The text includes an overview of the Register for reference by Governments and the interested public, as well as original material to guide national points of contact in preparing and submitting reports for the Register. The second part of the paper contains the report of the 2022 Group of Governmental Experts on the continuing operation of the Register.