BUREAU INTERNATIONAL DES EXPOSITIONS (BIE)

The Bureau International des Expositions (BIE) was founded in 1928 and began operations in 1931. It supervises the correct application of the Convention Relating to International Exhibitions on behalf of 179 member countries. The BIE has its headquarters in Paris, France.
Not all events that most people would categorize as a World Expo have been sanctioned by the BIE, notably the 1964-1965 New York World's Fair.
Currently, the BIE regulates Registered expositions that are held in years ending in 0 and 5, and Recognized expositions that are allowed to happen once in between each larger expo (but not in an adjacent year).

Member Countries of the BIE
Georgia
Germany
Ghana
Greece
Grenada
Guinea
Guinea-Bissau
Guyana
Haiti
Honduras
Hungary
Iceland
Indonesia
Iran
Iraq
Israel
Italy
Jamaica
Japan
Jordan
Kazakhstan
Kenya
Kiribati
Kuwait
Kyrgyzstan
Laos
Lebanon
Lesotho
Liberia
Libya
Lithuania
Madagascar
Malawi
Malaysia
Maldives
Mali
Malta
Marshall Islands
Mauritania
Mauritius
Mexico
Monaco
Mongolia
Montenegro
Morocco
Mozambique
Namibia
Nauru
Nepal
Netherlands
New Zealand
Nicaragua
Niger
Nigeria
North Korea
Norway
Oman
Pakistan
Palau
Panama
Afghanistan
Albania
Algeria
Andorra
Angola
Antigua and Barbuda
Argentina
Armenia
Austria
Azerbaijan
Bahamas
Bahrain
Bangladesh
Barbados
Belarus
Belgium
Belize
Benin
Bosnia and Herzegovina
Botswana
Brazil
Brunei
Bulgaria
Burkina Faso
Burundi
Cabo Verde
Cambodia
Cameroon
Central African Republic
Chad
Chile
China
Colombia
Comoros
Congo
Cook Islands
Costa Rica
Côte d'Ivoire
Croatia
Cuba
Cyprus
Czech Republic
Democratic Republic of the Congo
Denmark
Djibouti
Dominica
Dominican Republic
Ecuador
Egypt
El Salvador
Equatorial Guinea
Eritrea
Estonia
Eswatini
Ethiopia
Fiji
Finland
France
Gabon
Gambia
Paraguay
Peru
Philippines
Poland
Portugal
Qatar
Romania
Russia
Rwanda
Saint Kitts and Nevis
Saint Lucia
Saint Vincent and the Grenadines
Samoa
San Marino
São Tomé and Príncipe
Saudi Arabia
Senegal
Serbia
Seychelles
Sierra Leone
Slovakia
Slovenia
Solomon Islands
Somalia
South Africa
South Korea
South Sudan
Spain
Sri Lanka
Sudan
Suriname
Sweden
Switzerland
Syria
Tajikistan
Tanzania
Thailand
Timor-Leste
Togo
Tonga
Tunisia
Turkey
Turkmenistan
Tuvalu
Uganda
Ukraine
United Arab Emirates
United Kingdom
United States
Uruguay
Uzbekistan
Vanuatu
Venezuela
Vietnam
Yemen
Zambia
Zimbabwe
UN member countries who are not BIE members:
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Australia
-
Bhutan
-
Bolivia
-
Canada
-
Guatemala
-
India
-
Ireland
-
Latvia
-
Liechtenstein
-
Luxembourg
-
Micronesia
-
Moldova
-
Myanmar
-
North Macedonia
-
Papua New Guinea
-
Singapore
-
Trinidad and Tobago
BIE member countries who are not UN members:
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Kosovo
-
Palestine