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