linguistic:voice_change, information:classification
Diplomacy

Since medieval times the episcopal see of Rome has been recognized as a sovereign entity. The Holy See (not the State of Vatican City) maintains formal diplomatic relations with and for the most recent establishment of diplomatic relations with 183 sovereign states, and also with the European Union, and the Sovereign Military Order of Malta, as well as having relations of a special character with the Palestine Liberation Organization; 69 of the diplomatic missions accredited to the Holy See are situated in Rome. The Holy See maintains 180 permanent diplomatic missions abroad, of which 74 are non-residential, so that many of its 106 concrete missions are accredited to two or more countries or international organizations. The diplomatic activities of the Holy See are directed by the Secretariat of State (headed by the Cardinal Secretary of State), through the Section for Relations with States. There are 12 internationally recognized states with which the Holy See does not have relations. The Holy See is the only European subject of international law that has diplomatic relations with the government of the Republic of China (Taiwan) as representing China, rather than the government of the People's Republic of China (see Holy See–Taiwan relations).

The British Foreign and Commonwealth Office speaks of Vatican City as the "capital" of the Holy See, although it compares the legal personality of the Holy See to that of the Crown in Christian monarchies and declares that the Holy See and the state of Vatican City are two international identities. It also distinguishes between the employees of the Holy See (2,750 working in the Roman Curia with another 333 working in the Holy See's diplomatic missions abroad) and the 1,909 employees of the Vatican City State. The British Ambassador to the Holy See uses more precise language, saying that the Holy See "is not the same as the Vatican City State.... (It) is the universal government of the Catholic Church and operates from the Vatican City State." This agrees exactly with the expression used by the website of the United States Department of State, in giving information on both the Holy See and the Vatican City State: it too says that the Holy See "operates from the Vatican City State".

The Holy See is a member of various international organizations and groups including the International Atomic Energy Agency (IAEA), International Telecommunication Union, the Organization for Security and Co-operation in Europe (OSCE), the Organisation for the Prohibition of Chemical Weapons (OPCW) and the United Nations High Commissioner for Refugees (UNHCR). The Holy See is also a permanent observer in various international organizations, including the United Nations General Assembly, the Council of Europe, UNESCO (United Nations Educational, Scientific and Cultural Organization), the World Trade Organization (WTO), and the Food and Agriculture Organization (FAO).