| 18 | Holy Name of Mary College School | MISSISSAUGA | Site based only | Conference of Independent Schools of Ontario | Visit |
| 23 | Kendelhurst Academy | Mississauga | Site based only | Ontario Federation of Independent Schools | Visit |
| 88 | Jaya International High School | Mississauga | Online/Site Based | Independent and Private School Forum | Visit |
| 93 | Le Mother Mary High School | Mississauga | Online/Site Based | Independent and Private School Forum | Visit |
| 97 | Lynn-Rose College | Mississauga | Online/Site Based | IB Schools of Ontario | Visit |
| 105 | Olive Grove High School | Mississauga | Online/Site Based | Muslim Association of Canada | Visit |
| 115 | Sherwood Heights School | Mississauga | Site based only | Independent and Private School Forum | Visit |
| 116 | Sherwood Heights School - Mississauga | Mississauga | Site based only | Independent and Private School Forum | Visit |
| 119 | Spark Asher Academy | Mississauga | Online/Site Based | Independent and Private School Forum | Visit |
| 162 | Al Huda Elementary School | Mississauga | Site based only | No Association Membership | Visit |
| 166 | AL-Manarat Islamic School | Mississauga | Online/Site Based | No Association Membership | Visit |
| 167 | Al-Risala Academy | MISSISSAUGA | Online/Site Based | No Association Membership | Visit |
| 177 | AM International Private Schools and Childcare | Mississauga | Online Only | No Association Membership | Visit |
| 199 | Averroes Academy | Mississauga | Online/Site Based | No Association Membership | — |
| 203 | Baig Academy | Mississauga | Online/Site Based | No Association Membership | Visit |
| 208 | Beacon House International College | Mississauga | Online/Site Based | No Association Membership | Visit |
| 221 | Blyth Academy Mississauga | Mississauga | Site based only | No Association Membership | Visit |
| 236 | Brock Academy | Mississauga | Online/Site Based | No Association Membership | Visit |
| 238 | Bronte College | Mississauga | Online/Site Based | No Association Membership | Visit |
| 246 | C.E. Academy | Mississauga | Site based only | No Association Membership | Visit |
| 284 | Canadian International Secondary School | Mississauga | Online/Site Based | No Association Membership | — |
| 287 | Canadian Southeastern Academy | Mississauga | Online/Site Based | No Association Membership | Visit |
| 296 | CareerQuest - Vaughan | Mississauga | Site based only | No Association Membership | Visit |
| 342 | Dewey College | Mississauga | Online/Site Based | No Association Membership | Visit |
| 361 | Elpis College | Mississauga | Online/Site Based | No Association Membership | Visit |
| 362 | ELPIS COLLEGE TORONTO | Mississauga | Online/Site Based | No Association Membership | Visit |
| 371 | Everest Academy Centre | Mississauga | Online/Site Based | No Association Membership | — |
| 382 | Flexi Academy | Mississauga | Online Only | No Association Membership | Visit |
| 391 | Futures Canadian School | Mississauga | Online/Site Based | No Association Membership | — |
| 400 | Global Journeys | Mississauga | Online/Site Based | No Association Membership | Visit |
| 404 | GN Rising Excellence Institute Inc. | Mississauga | | — | Visit |
| 457 | Intellexi Learning Academy | Mississauga | Online/Site Based | No Association Membership | Visit |
| 460 | International Canadian Future School | Mississauga | Online/Site Based | No Association Membership | — |
| 465 | ISNA High School | Mississauga | Online/Site Based | No Association Membership | Visit |
| 493 | Khalsa School Malton | Mississauga | Online/Site Based | No Association Membership | Visit |
| 524 | M'Learning Student Centre | Mississauga | Online Only | No Association Membership | — |
| 536 | Maple Ridge Academy | Mississauga | Online/Site Based | No Association Membership | Visit |
| 550 | McCanny Secondary School (West Campus) | Mississauga | Site based only | No Association Membership | Visit |
| 552 | Meadow Green Academy - Lakeshore | Mississauga | Site based only | No Association Membership | Visit |
| 555 | Mentor College | Mississauga | Site based only | No Association Membership | Visit |
| 569 | Mississauga Secondary Academy | Mississauga | Online/Site Based | No Association Membership | Visit |
| 577 | Mount Sinai Education | Mississauga | Online Only | No Association Membership | — |
| 592 | Newton's Grove School | Mississauga | Site based only | No Association Membership | Visit |
| 601 | North Uplands School of Canada | Mississauga | Online/Site Based | No Association Membership | Visit |
| 603 | Northbridge Collegiate | Mississauga | Online Only | No Association Membership | Visit |
| 604 | NorthCan Academy | MISSISSAUGA | Online Only | No Association Membership | Visit |
| 605 | Northcrest Private School | Mississauga | Online/Site Based | No Association Membership | — |
| 624 | Online SS Ontario | Mississauga | | — | Visit |
| 626 | OnScholars | Mississauga | Online Only | No Association Membership | Visit |
| 638 | Ontario International Secondary School | Mississauga | Online/Site Based | No Association Membership | Visit |
| 639 | Ontario Maple Academy | Mississauga | Online/Site Based | No Association Membership | Visit |
| 641 | Ontario Online Schools | Mississauga | Online Only | No Association Membership | Visit |
| 643 | Ontario Premier School | mississauga | Online/Site Based | No Association Membership | — |
| 671 | Philopateer Christian College | Mississauga | Online/Site Based | Other | Visit |
| 677 | Quark West School | Mississauga | Online/Site Based | No Association Membership | Visit |
| 678 | Queen Elizabeth Academy | Mississauga | Online/Site Based | No Association Membership | Visit |
| 689 | Riyadh Alsalehin School | Mississauga | Online/Site Based | No Association Membership | Visit |
| 698 | ROYAL CANADIAN INTERNATIONAL SCHOOL | Mississauga | Online Only | No Association Membership | Visit |
| 701 | Royal Ontario Academy | Mississauga | Online/Site Based | No Association Membership | — |
| 705 | Safa & Marwa Islamic School | Mississauga | Online/Site Based | No Association Membership | Visit |
| 717 | Shiloh Christian Institute | Mississauga | Site based only | No Association Membership | Visit |
| 734 | St. Jude's Academy | Mississauga | Site based only | No Association Membership | Visit |
| 752 | TG Academy | Mississauga | Online/Site Based | No Association Membership | Visit |
| 757 | The Elite Academy of Exellence | Mississauga | | — | — |
| 758 | The Erindale Academy | Mississauga | Online/Site Based | No Association Membership | Visit |
| 760 | The New Educator | Mississauga | Online Only | No Association Membership | — |
| 763 | THINNOX School | Mississauga | Online/Site Based | No Association Membership | Visit |
| 775 | Toronto Central Academy | Mississauga | Online Only | No Association Membership | Visit |
| 783 | Toronto International Academy | Mississauga | Online/Site Based | No Association Membership | Visit |
| 786 | Toronto International Oslife School | Mississauga | Online/Site Based | No Association Membership | Visit |
| 796 | Toronto World School | Mississauga | Online/Site Based | No Association Membership | Visit |
| 819 | USCA Academy | Mississauga | Online/Site Based | No Association Membership | Visit |