See also lists of all IFRC regions, National Societies, and Country codes

: U5MR : under-5 mortality rate
: UAE RC : Red Crescent Society of the United Arab Emirates
: UASC : Unaccompanied and separated children
: UCD : User-Centred Design
: UCP : Urban Collaboration Platform
: UDD : User-Driven-Development
: UHC : Universal Health Coverage
: UHS : Universal Health Security
: UMIC : Upper-middle income country (countries)
: UN : United Nations
: UN HLM : UN High Level Meeting
: UN IGME : Same as IGME
: UN Women : United Nations Entity for Gender Equality and the Empowerment of Women
: UNAIDS : Joint United Nations Programme on HIV/AIDS
: UNCTAD : United Nations Conference on Trade and Development
: UNDAF : United Nations Development Action Framework
: UNDP : United Nations Development Programme
: UNFPA : United Nations Population Fund, previously the //United Nations Fund for Population Activities//
: UNGA : United Nations General Assembly
: UNHCR : UN Refugee Agency (United Nations High Commissioner for Refugees)
: UNICEF : United Nations Children’s Fund
: UNISDR : United Nations Office for Disaster Risk Reduction
: UNOCHA : same as OCHA
: UNODC : United Nations Office on Drugs and Crime
: UNRWA : United Nations Relief and Works Agency for Palestine Refugees in the Near East
: URC : Uruguayan Red Cross
: URCS : The Uganda Red Cross Society _ Ukrainian Red Cross Society _ Red Crescent Society of Uzbekistan
: US : United States (of America)
: U.S. : United States (of America)
: USA : United States of America
: USAID : Unites States Agency for International Development
: USD : United States dollar
: UXO : Unexploded ordnance