| RANKING | SCHOOL | COUNTRY |
| 1 | Grey College | South Africa |
| 2 | Paul Roos | South Africa |
| 3 | Sedbergh | England |
| 4 | St Kents | New Zealand |
| 5 | Glenwood | South Africa |
| 6 | Hamilton Boys | New Zealand |
| 7 | Paarl Gim | South Africa |
| 8 | Hartpury College | England |
| 9 | St Peters, Auckland | New Zealand |
| 10 | Selborne | South Africa |
| 11 | Sacred Heart | New Zealand |
| 12 | Paarl Boys | South Africa |
| 13 | Harrow | England |
| 14 | Oakdale | South Africa |
| 15 | Ratu Kadavulevu | Fiji |
| 16 | Monument | South Africa |
| 17 | Napier Boys | New Zealand |
| 18 | Blackrock College | Ireland |
| 19 | Affies | South Africa |
| 20 | Christchurch Boys | New Zealand |
2018 Global Top 20
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Last Update: Season Completed