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A good education will get your daughter to university. A great one will get her through.

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About Us

Established in 1891, SMLS has been challenging young women to think expansively about engage fearlessly with a personalized, real-world learning experience that teaches them to see the future as a gift.

Anchored in a nurturing community of exceptionally committed educators and supportive peers, SMLS is where girls go to create the best version of themselves. This is the place where the new, the unfamiliar, even the seemingly impossible, becomes, “I got this.”

$1.3M

in scholarships awarded to 2024 grads
10 Acres

Campus surrounded by nature in olde oakville
115+

employees with an average tenure of 8+ years
15-20

average class size
3500+

An active alumnae network of mentors, career connections and friends around the globe
AP

Students take in-school Advanced Placement courses in their graduating year
Entry Years

Main Entry Years: JK, Grade 6 and Grade 12
Financial Aid

available through Apple Financial Services
School Bus

Extensive bus routes for commuter students

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Join Us for an Open House

We would love the opportunity to meet you! Join us for one of our upcoming Open Houses:

Thursday, October 16
SMLS Open House
9:00 - 11:00 am

Saturday, October 25
OIS Open House
10:00 am - 2:00pm

Tuesday, October 28
SMLS Open House
9:00 - 11:00 am

Not able to attend one of these days? You can book a private tour to see our impressive facilities, get your questions answered, and meet with members of our administration team.

Research tells the story of how girls learn.

List of 3 items.

Higher Self-Confidence

A majority of girls' school grads report higher self-confidence over their co-ed peers.
Leadership Opportunities

93% of girls' school graduates say they were offered greater leadership opportunities than their co-ed peers.
Post-secondary Success

99% of students at girls' schools expect to earn a four-year degree. More than 2/3 expect to earn a graduate or professional degree.

Learn more about the SMLS Senior School experience.

Testimonials

Ceryna Li, Parent of Cindy, Grade 11 AND Sophia, Grade 6

"I have been part of the school community for two years, and the most significant feeling I've experienced during this time is an ever-growing sense of belonging. This strong foundation has made me feel truly connected to the school and valued as a member. It’s also one of the main reasons I am eager to contribute to the community.

When thinking from the children’s perspective, if they feel a sense of belonging, they will naturally be more relaxed, confident, and courageous in facing challenges. For this reason, I believe that a sense of belonging is essential to realizing the school's vision and mission. It is also the value I appreciate the most."
Miranda Plant Byers, Class of 2003

At [SMLS], I was taught that my ideas and voice mattered. I was taught to care for myself and others, both at school and in my community. We practiced the joy that comes from supporting and lifting up other women, and it was so easy and natural to do.
Kirsten Chalmers, parent of Vivienne, Grade 5; Josie, Grade 8; and Addison, Grade 12

SMLS is an exceptional institution where our girls have thrived academically and personally. With a rigorous curriculum in both science and math, they are challenged to excel while receiving unwavering support from dedicated and compassionate staff. SMLS also fosters creativity, offering outstanding programs in the arts that allow students to express themselves and grow. The nurturing environment has encouraged our daughters to pursue their passions, and they have grown into confident, curious and driven young women largely due to the school’s specialized approach for educating girls.
Anne-Marie Tice, SMLS alumna Class of 1990 and parent to Charlotte, Class of 2019; Isabelle, Class of 2021; and Sophia, Class of 2024

From Arts and Design, to Global Citizenship, to Professional Internships, SMLS’s Signature Programs gave my daughters incredible experiences that shaped their character and prepared them beautifully for the journey after graduation. I believe we made the absolute best choice for our girls.

Inside SMLS

List of 3 news stories.

Ms. Gram's Artistic Vision Shines in New Caledon Library Mural
7/21/2025
SMLS is delighted to announce a significant public art installation by our very own Junior School Art Teacher, Ms. Gram. She was selected from a highly talented group of local artists to transform the Caledon Public Library’s reading garden with a captivating mural.
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SMLS Memories From Head Prefect
6/13/2025
As the year comes to an end and my graduation day nears, I have found myself reflecting with overwhelming gratitude on all that I have experienced at St. Mildred’s. Thanks to the all-girls student body, St. Mildred’s is a school specifically designed to inspire female success and leadership. Within the halls of SMLS, the wonderful staff and teachers have pushed me to challenge myself with the security of knowing I belong to a community that will lift me up if I fall and encourage me to try again. The everlasting enthusiasm of my peers and classmates created an environment where I feel empowered to follow my passions without hesitation. Whether it was my position as Head Prefect or Co-Chair of the SocDoc Committee, or even performing in school musicals or playing on the soccer team, I poured myself into all opportunities that came my way. This was only possible because of the strong foundation of support that my peers and teachers laid.
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JS5 Conquers Norval
6/11/2025
On May 28, the JS5 students embarked on a two-night field trip to Norval Outdoor School. Throughout their stay, the students embraced many exciting adventures—from climbing high ropes over 40 feet in the air, which required bravery and focus, to taking part in choice activities like tubing down the Credit River, which called for a willingness to take risks. Some opted for beekeeping, which took courage and curiosity, while others tried firebuilding, which demanded teamwork and enthusiasm.
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Discover More

We are delighted that you are considering St. Mildred’s-Lightbourn School for your daughter. Inquire today to learn more about our program, book a tour, or find out more about our application process.