Disarmament: a Basic Guide by 
The United Nations Office for Disarmament Affairs Occasional Papers are a series of ad hoc publications featuring, in edited form, papers or statements made at meetings, symposiums, seminars, workshops or lectures that deal with topical issues in the field of arms limitation, disarmament and international security.
The Trade in Small Arms and Light Weapons on the Dark Web by 
Perspectives on Lethal Autonomous Weapon Systems by 
Cyberwarfare and Its Impact on International Security by Here are some links to resource guides on other topics related to disarmament, by type of weapon:
The Dag Hammarskjöld Library at United Nations Headquarters, New York, have also created this useful research guide specifically for UN Documentation: Disarmament.
Conference on Disarmament (CD)
It was established in 1979 as the single multilateral disarmament negotiating forum of the international community. Issues: cessation of the nuclear arms race and nuclear disarmament; prevention of nuclear war; prevention of an arms race in outer space; effective international arrangements to assure non-nuclear-weapon States against the use or threat of use of nuclear weapons; new types of weapons of mass destruction and new systems of such weapons including radiological weapons.
United Nations Office for Disarmament Affairs (UNODA)
The UNODA promotes the goal of nuclear disarmament and non-proliferation and the strengthening of the disarmament regimes in respect to other weapons of mass destruction, chemical, and biological weapons. It also promotes disarmament efforts in the area of conventional weapons including emerging technologies. United Nations Disarmament Yearbook
United Nations Security Council (UNSC):
Composed of 15 members, it takes the lead in determining the existence of a threat to the peace or act of aggression.
Resolution 1540 (2004) imposes binding obligations on all States to establish domestic controls to prevent the proliferation of nuclear, chemical, and biological weapons, and their means of delivery, including by establishing appropriate controls over related materials.
United Nations Committee on the Peaceful Uses of Outer Space (COPUOS)
The Committee on the Peaceful Uses of Outer Space was set up by the General Assembly in 1959 (resolution 1472 (XIV)) to review the scope of international cooperation in peaceful uses of outer space, to devise programs in this field to be undertaken under United Nations auspices, to encourage continued research and the dissemination of information on outer space matters, and to study legal problems arising from the exploration of outer space.
International Telecommunication Union
Founded in 1865 to facilitate international connectivity in communications networks through activities in the area of radiocommunications, standardization, and development.
Secretary-General's High-level Panel on Digital Cooperation
The High-level Panel on Digital Cooperation was established by United Nations Secretary-General António Guterres on 12 July 2018. Its main goals are to foster cooperation across different domains and borders for realizing the potential of digital technologies while mitigating and addressing potential unintended consequences.
First Committee of the General Assembly:
The First Committee deals with disarmament, global challenges, and threats to peace that affect the international community and seeks out solutions to the challenges in the international security regime.
United Nations Disarmament Commission (UNDC)
The United Nations Disarmament Commission is a subsidiary organ of the General Assembly, composed of all Member States of the United Nations, with the function of considering and making recommendations on various problems in the field of disarmament.
More UN Organs and related entities: Resource guide on disarmament (global issues) - UN Organs
See also: Negotiations forums, verification institutions, confidence-building measures, export control regimes