| School Name | Country | Region |
|---|---|---|
| Abbotsholme School | United Kingdom | Europe and the Mediterranean |
| Aiglon | Switzerland | Europe and the Mediterranean |
| AKS Lytham | United Kingdom | Europe and the Mediterranean |
| Áleph School | Peru | Americas |
| All Saints’ College | India | South Asia and the Gulf |
| Amman Baccalaureate School | Jordan | South Asia and the Gulf |
| Appleby College | Canada | Americas |
| Ashbury College | Canada | Americas |
| Aubrick Multicultural Bilingual School | Brazil | Americas |
| Ballarat Grammar | Australia | Australasia and East Asia |
