| Afghanistan | St Andrew’s, Dublin |
| Algeria | John Warner |
| Argentina (SC) | High School, Dublin |
| Armenia | St Joseph’s Greek |
| Australia (SC) | Benenden |
| Azerbaijan | St Joseph’s Greek |
| Bangladesh | RRS |
| Bolivia (and party to the ICJ case) | RRS |
| Botswana | Terenure |
| Brazil | International School of Verona |
| Cambodia | Shrewsbury |
| Canada | The American School in London |
| Chad (SC) | St Edmund’s College, Ware |
| Chile (SC) (and party to the ICJ case) | St Andrew’s, Dublin |
| China (*SC) | Shrewsbury |
| Congo (Dem Rep) | Frankfurt International |
| Croatia | Westminster |
| Cuba | Rathdown |
| Denmark | Westminster |
| Ecuador | Cheadle Hulme |
| Egypt | Habs Boys |
| Estonia | Blackrock College |
| Ethiopia | Rathdown |
| Finland | Impington Village |
| France (*SC) | St Joseph’s Greek |
| Georgia | St Andrew’s, Dublin |
| Germany | Cours St Charles |
| Ghana | High School, Dublin |
| Greece | Habs Girls |
| Haiti | Terenure |
| Hungary | John Warner |
| India | Exeter |
| Indonesia | International School of Verona |
| Iran | RRS |
| Iraq | Terenure |
| Ireland | Santa Margarita |
| Israel | The American School in London |
| Japan | Hitachi First High School |
| Jordan (SC) | Habs Boys |
| Kenya | Westminster |
| Korea (Dem Rep) – North | St Edmund’s College, Ware |
| Korea (Rep) – South (SC) | Frankfurt International |
| Lebanon | St Andrew’s, Dublin |
| Lithuania (SC) | RRS |
| Luxembourg (SC) | Terenure |
| Malaysia | RRS |
| Mexico | Santa Margarita |
| Morocco | The American School in London |
| N/A | Langley Park Boys |
| Netherlands | St Gerards |
| New Zealand | Colegio Ayalde |
| Nicaragua | St Andrew’s, Dublin |
| Nigeria (SC) | The American School in London |
| Norway | International School of Helsinki |
| Pakistan | Rathdown |
| Paraguay | John Warner |
| Peru | Shrewsbury |
| Philippines | Frankfurt International |
| Poland | Åas videregående skole |
| Portugual | Frankfurt International |
| Qatar | Blackrock College |
| Romania | St Joseph’s Greek |
| Russian Federation (*SC) | Exeter |
| Rwanda (SC) | International School of Helsinki |
| Saudi Arabia | Trinity School |
| Serbia | St Joseph’s Greek |
| Singapore | Haileybury |
| Somalia | The American School in London |
| South Africa | St Andrew’s, Dublin |
| South Sudan | Habs Boys |
| Spain | Terenure |
| Sri Lanka | Frankfurt International |
| Sudan | St Andrew’s, Dublin ( |
| Syria | Habs Boys |
| Thailand | Habs Boys |
| UAE | Santa Margarita |
| Uganda | Rathdown |
| Ukraine | Åas videregående skole |
| United Kingdom (*SC) | Santa Margarita |
| USA (*SC) | Cheadle Hulme |
| Viet Nam | Cheadle Hulme |
| Yemen | High School, Dublin |
| Zimbabwe | RRS |
