| 79 | 1 | Bishop Paul Francis Reding Catholic Secondary School | Milton | Catholic | 8.2 | 8.2 | 8.0 | 7.7 | +0.5 ↑ | Visit |
| 97 | 2 | Corpus Christi Catholic Secondary School | BURLINGTON | Catholic | 8.1 | 8.1 | 7.5 | 7.6 | +0.5 ↑ | Visit |
| 100 | 3 | St. Ignatius of Loyola Catholic Secondary School | Oakville | Catholic | 8.1 | 8.1 | 8.1 | 8.2 | -0.1 ↓ | Visit |
| 103 | 4 | St. Thomas Aquinas Catholic Secondary School | Oakville | Catholic | 8.1 | 8.1 | 8.1 | 7.7 | +0.4 ↑ | Visit |
| 144 | 5 | Assumption Catholic Secondary School | Burlington | Catholic | 7.8 | 7.8 | 7.5 | 7.3 | +0.5 ↑ | Visit |
| 242 | 6 | Christ the King Catholic Secondary School | Georgetown | Catholic | 7.3 | 7.3 | 7.8 | 7.1 | +0.2 ↑ | Visit |
| 245 | 7 | Holy Trinity Catholic Secondary School | Oakville | Catholic | 7.3 | 7.3 | 7.8 | 7.5 | -0.2 ↓ | Visit |
| 307 | 8 | Notre Dame Catholic Secondary School | Burlington | Catholic | 7.1 | 7.1 | 7.6 | 6.7 | +0.4 ↑ | Visit |
| 338 | 9 | St. Francis Xavier Catholic Secondary School | Milton | Catholic | 6.9 | 6.9 | 6.8 | 6.7 | +0.2 ↑ | — |
| 411 | 10 | St. Kateri Tekakwitha Catholic Secondary Catholic School | Milton | Catholic | 6.6 | 6.6 | 7.4 | 4.7 | +1.9 ↑ | — |
| 775 | 11 | Thomas Merton Catholic Secondary School | Oakville | Catholic | — | — | — | — | — | Visit |
| 790 | 12 | Thomas Merton Online Catholic School | Oakville | Catholic | — | — | — | — | — | — |