This guide covers the top public, Catholic, and private high schools in Mississauga — how they’re ranked, what makes each one stand out, and how the Mississauga options compare to what’s available in Toronto for families open to the commute.
Mississauga’s top high schools are genuinely competitive — and the students who arrive in Grade 9 already working above grade level in mathematics have a measurable advantage from day one.
How Mississauga High Schools Are Ranked
Most parents researching Mississauga high schools eventually encounter the Fraser Institute’s annual Ontario school rankings, which rate schools on a scale of 1 to 10 based on academic indicators drawn from EQAO and OSSLT results. These are the most widely used public school comparison tool available in Ontario and are worth understanding before putting too much weight on any single number.
A few things matter when reading these rankings for Mississauga schools. First, the rankings measure average academic outcomes across the full student population — they do not tell you how the school performs for high-achieving students specifically. A school with a broad intake and a strong gifted or advanced programme may have a lower overall rating than a school with a more academically selective enrolment, even if the programme quality for top students is comparable. Second, most of Mississauga’s private schools do not appear in Fraser rankings at all, since Ontario’s independent schools are not required to administer EQAO — which means comparing private and public schools using the same metric is not straightforward.
For a full explanation of how the Fraser school ranking system works and what it does and doesn’t measure, see our Fraser school rankings guide. For a province-wide comparison, see our Ontario high school ranking guide.
Top Public High Schools in Mississauga
Mississauga’s public high schools are administered by the Peel District School Board (PDSB), one of Ontario’s largest boards. Academic outcomes vary considerably across the board’s schools, and the top performers in Mississauga are genuinely strong by Ontario standards.
Lorne Park Secondary School consistently ranks among the highest-rated public high schools in Mississauga and in Peel Region. Located in the Lorne Park neighbourhood in southwest Mississauga, it has a strong reputation for academics, arts, and a cohesive school culture. The community it draws from — one of Mississauga’s most established residential areas — contributes to its consistently strong results.
Applewood Heights Secondary School is another well-regarded PDSB school with consistently solid Fraser Institute ratings and a reputation for strong university preparation.
Cawthra Park Secondary School is notable within Mississauga’s public system for its Regional Arts Programme — one of the strongest specialist arts programmes in Peel Region, drawing students from across Mississauga and beyond on an audition basis.
Port Credit Secondary School has a strong academic reputation, bolstered by its location in one of Mississauga’s most sought-after communities and a consistent university placement record.
Brian J. Fleming Catholic Secondary School and several other newer schools in Mississauga’s growing communities have been building reputations, though the most consistently cited top performers remain concentrated in the city’s more established neighbourhoods.
Programme options within PDSB’s Mississauga schools that raise the academic ceiling for motivated students include Advanced Placement (AP) courses and various specialist programmes. Identifying which specific school offers the programme your child needs — rather than choosing purely on overall school ranking — is worth the additional research.
Top Catholic High Schools in Mississauga
Catholic high schools in Mississauga fall under the Dufferin-Peel Catholic District School Board (DPCDSB), a large and generally well-regarded board that has historically produced strong results in provincial assessments.
St. Aloysius Gonzaga Secondary School in Mississauga consistently earns among the highest Fraser Institute ratings in the Dufferin-Peel system — it has recorded perfect or near-perfect 10/10 scores in recent years, placing it at the very top of Ontario’s secondary school rankings. Located in northeast Mississauga, it draws from a highly educated and academically motivated community. Its results reflect both the quality of the school and the strength of its intake.
Loyola Catholic Secondary School and Cardinal Leger Secondary School are also well-regarded options within the DPCDSB, with strong academic cultures and consistent university placement.
Our Lady of Mount Carmel Secondary School in north Mississauga has a strong reputation within the Catholic system, with good results and an active school community.
It is worth noting that Dufferin-Peel Catholic schools are publicly funded and charge no tuition — families simply need to be Catholic (or in some cases register with the Catholic board) to access them. The strong academic results at schools like St. Aloysius Gonzaga make the Catholic board a genuinely compelling option for eligible families who might otherwise be considering private school.
Top Private High Schools in Mississauga
Mississauga’s private school sector is smaller than Toronto’s, but several schools serve families seeking independent school education without the commute into the city.
TFS – Canada’s International School draws significant Mississauga enrolment despite its Toronto location, given its French-English bilingual IB programme and the communities it serves across the west GTA. Worth including in any Mississauga-area private school search.
Mentor College is Mississauga’s most prominent local independent school, offering JK–12 education with a strong academic culture and consistent university placement results. It is the school most Mississauga families land on when specifically looking for a private option that doesn’t require going into Toronto.
Several smaller private and Montessori schools operate across Mississauga, generally focused at the elementary level, with families then transitioning to either the public, Catholic, or larger independent schools for secondary.
For a detailed breakdown of Mississauga’s private school options, fees, and admissions, see our best private schools in Mississauga guide.
Mississauga vs Toronto High Schools: Is It Worth Commuting?
For families with high-achieving students, the question of whether to access Toronto’s most academically elite independent schools is worth taking seriously — and the honest answer is that it depends on how competitive the student is and what specifically they are looking for.
Toronto’s top independent schools — Upper Canada College, Branksome Hall, Havergal College, Bishop Strachan — have a national and international profile, alumni network depth, and university placement record at the very top that Mississauga’s local options, strong as some are, do not replicate. For a student who is genuinely competitive for those schools and is targeting the most selective Canadian and international university programmes, the commute from Mississauga into central Toronto may be the right call.
Against this, the commute from Mississauga to central Toronto is 45 minutes to over an hour each way in normal conditions, more in traffic. That is a significant time commitment for a secondary student with a full academic and extracurricular programme.
For families who conclude that local Mississauga options are the right fit, the Catholic and public systems both offer genuine quality — the question is whether the specific programme, pace, and culture at those schools match what your child needs. For context on what Toronto’s independent sector offers, see our Toronto private schools guide (confirmed live in earlier briefs).
What Mississauga’s Best Schools Look For
Whether the destination is a top public school with a specialist programme, a competitive Catholic school like St. Aloysius Gonzaga, or an independent school, the students who thrive in Mississauga’s most demanding academic environments share common characteristics.
Strong mathematics. Across every type of school in this guide, mathematical performance at or above grade level is the clearest predictor of academic readiness. Grade 9 mathematics in the Ontario academic stream builds on foundations from Grades 6, 7, and 8 — students who arrive with gaps in those foundations find the curriculum pace difficult from the start. Our guide to the Ontario Grade 9 math curriculum outlines exactly what students are expected to know and be able to do from day one.
Consistent academic record. Schools — particularly those with optional or specialist programmes — look at cumulative Grade 7 and 8 results, not just a single strong term. Consistency across subjects and across years signals a student who performs habitually, not occasionally.
Extracurricular engagement. Specialist programmes (arts, athletics, science) require demonstrated engagement outside the classroom. Private schools weigh extracurricular involvement alongside academic results as part of a holistic admissions picture.
Readiness for pace. Mississauga’s top schools — public and private — move faster than an average classroom. Students who are already working above grade level adjust more smoothly, perform better in the first critical term, and are less likely to fall into the remediation loop that can follow a difficult Grade 9 start.
How to Prepare Your Child
The window for preparation that makes a real difference at Mississauga’s top high schools is Grades 6, 7, and 8 — before the Grade 9 entry point, not after it.
Build above-grade-level math now. A student who arrives in Grade 9 already comfortable with algebraic reasoning and problem-solving is ahead from day one, rather than catching up. That level of readiness is built over 12–18 months of consistent work, not in the weeks before September.
Know where the gaps are. Rather than generic extra practice, an effective preparation plan identifies the specific concepts where your child’s current skills fall below what Grade 9 will expect, and addresses those gaps directly. A clear diagnostic is the right starting point.
Develop independent study habits. The most consistent feedback from parents whose children struggled in the transition to Mississauga’s top high schools is not about content knowledge — it is about self-management. Students who can organise their own revision time, identify when they are stuck, and seek help proactively adjust significantly better to the faster pace.
Think Academy works with students in Grades 1–12 across the GTA, building the mathematical foundations and academic habits that Mississauga’s top high schools expect from day one.
Frequently Asked Questions
What is the best high school in Mississauga?
St. Aloysius Gonzaga Secondary School (Catholic) consistently earns among the highest Fraser Institute ratings of any high school in Mississauga and in Peel Region, including perfect 10/10 scores in recent years. Among public schools, Lorne Park Secondary School is consistently one of the top-rated. For private options, Mentor College is the most prominent local independent school.
Do I need to be Catholic to attend a Catholic high school in Mississauga?
In practice, the Dufferin-Peel Catholic board gives priority to Catholic students but will admit students of other faiths when space permits. Families should check directly with the board and specific school about current policies, particularly for popular oversubscribed schools.
How do Mississauga high schools compare to Toronto?
Mississauga has genuinely strong public and Catholic schools that compare favourably with Ontario averages. Toronto’s advantage lies primarily in its independent school sector — UCC, Branksome Hall, Havergal — which has no equivalent in Mississauga in terms of national profile and alumni depth.
What programmes improve a student’s chances at the top Mississauga high schools?
AP programmes, specialist arts programmes (Cawthra Park), and gifted education streams within the public and Catholic boards all raise the academic ceiling for motivated students. Private school options including Mentor College offer smaller classes and a different academic culture.
When should preparation for high school start?
For students targeting Mississauga’s most competitive public specialist programmes or private schools, serious preparation should begin in Grade 6 or 7 at the latest. Grade 8 is still useful, but the students who are most competitive have typically been working above grade level consistently for a year or more before applying.
See our related guides: best private schools in Mississauga · best high schools in Ontario · Ontario high school ranking guide · Fraser school rankings guide · Ontario Grade 9 math curriculum
Give your child the academic edge Mississauga’s top high schools expect from day one.
