| T |
| TANZAM | Tanzania-Zambia Railroad Line. |
| TDW | Ton Deadweight. |
| TEE | Trans-Europe Express. |
| TELSTAR | Television Satellite of the USA. |
| TEM | Trans-European Motorway. |
| TIAS | Treaties and Other International Acts Series. |
| TIMS | The Institute of Management Sciences. |
| TIS | UN Treaty Information System. |
| U |
| UAE | United Arab Emirates. |
| UAS | United Arab States. |
| UFO | Unidentified Flying Objects. |
| UIA | Union of International Associations. |
| UK | United Kingdom. |
| UML | Union Monetaria Latina. |
| UN | United Nations. |
| UNCA | UN Correspondents Association. |
| UNCD | UN Centre for Disarmament. |
| UNCIO | UN Conference of International Organization. |
| UNCITRAL | UN Commission on International Trade Law. |
| UNCTAD | UN Conference on Trade and Development. |
| UNDOF | UN Disengagement Observer Force. |
| UNDP | UN Development Programme. |
| UNDRO | UN Disaster Relief Office. |
| UNEP | UN Environment Programme. |
| UNESCO | UN Educational, Scientific and Cultural Organization. |
| UNESOB | UN Economic and Social Office in Beirut. |
| UNFDAC | UN Fund for Drug Abuse Control. |
| UNFICYP | UN Peace-Keeping Force in Cypus. |
| UNFPA | UN Fund for Population Activities. |
| UNHCR | UN High Commissioner for Refugees. |
| UNIAPAC | International Christian Union of Business Executives. |
| UNICEF | UN Children's Fund. |
| UNIDO | UN Industrial Development Organization. |
| UNIFIL | UN Interim Force in Lebanon. |
| UNIPOM | UN India-Pakistan Observation Mission. |
| UNISIST | UN International System of Information on Science and Technology. |
| UNISPACE | UN Conference on the Exploration and Peaceful Uses of Outer Space. |
| UNITAR | UN Institute for Training and Research. |
| UNMOGIP | UN Military Observer Group in India and Pakistan. |
| UNRIP | UN Representative for India and Pakistan. |
| UNRISD | UN Research Institute for Social Development. |
| UNRRA | UN Relief and Rehabilitation Administration. |
| UNRWA | UN Relief and Works Agency for Palestine Refugees in the Near East. |
| UNSCEAR | UN Scientific Committee on the Effects of Atomic Radiation. |
| UNSCOB | UN Special Committee on the Balkans. |
| UNSDRI | UN Social Defence Research Institute. |
| UNSO | UN Sahelian Office. |
| UNTAG | UN Temporary Auxiliary Group. |
| UNTSO | UN Truce Supervision Organization. |
| UPU | Universal Postal Union. |
| URANCO | British-Dutch-West German Consortium for Processing Uranium. |
| USA | United States of America. |
| USAID | United States Agency for International Development. |
| USIA | US Information Agency. |
| USSR | Union of Soviet Socialist Republics. |
| V |
| VAT | Value Added Tax. |
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