Vienna is one of the four headquarters of the United Nations. Other headquarters are located in New York, Geneva and Nairobi. UN complex in Vienna was founded in 1979.

UN headquarters in Vienna includes following units:

• United Nations Office at Vienna (UNOV)
• United Nations Office on Drugs and Crime (UNODC)
• International Money Laundering Information Network (IMOLIN)
• International Narcotics Control Board (INCB)
• Office for Outer Space Affairs United Nations Postal Administration (UNPA)
• United Nations Information Service (UNIS)
• Office of the United Nations High Commissioner for Refugees (UNHCR)
• United Nations Office for Project Services (UNOPS)
• United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR)
• International Trade Law Division of the United Nations Secretariat / United Nations Commission on International Trade Law (UNCITRAL)
• Office of Internal Oversight Services (OIOS)
• United Nations Environment Programme (UNEP)
• United Nations Environment Programme - Interim Secretariat of the Carpathian Convention (UNEP Vienna ISCC)
• United Nations Register of Damage Caused by the Construction of the Wall in the Occupied Palestinian Territory (UNRoD)