UDEAC: Union douanière et économique de l'Afrique centrale. See Central African Customs and Economic Union.

Unbound commitments: commitments under the General Agreement on Trade in Services (GATS) which can be changed unilaterally by the country making them. They give the listing country complete flexibility to change its trading regime in the affected activity without the need to offer compensation. Unbound commitments are therefore much less valuable than binding commitments, though they may in some cases assist transparency.

UNCED: United Nations Conference on Environment and Development, held from 3 to 14 January 1992 in Rio de Janeiro. This conference adopted the United Nations Framework Convention on Climate Change, the Convention on Biological Diversity, Agenda 21, the Rio Declaration and the Statement on Forest Principles.

UNCITRAL:United Nations Commission on International Trade Law. Established in 1966 for the purpose of reducing or removing legal obstacles to the flow of international trade and the progressive harmonization and unification of the law of international trade. UNCITRAL has 36 members who are selected by the United Nations General Assembly. It is the core legal body within the United Nations system in the field of international trade law. UNCITRAL has pursued an extensive work program on subjects covering particularly international commercial arbitration and conciliation and the international transport and sale of goods. It is located in Vienna.

UNCITRAL Arbitration Rules: adopted on 15 December 1976. These rules are aimed at helping to settle disputes arising in the context of international commercial relations.