St. Mildred's-Lightbourn School, A Private All-Girls School, Oakville, ON

We know how girls learn.

We have a profound understanding of how girls learn, which is: Differently. The measure of our expertise is the bold mark our students will make on the world. As a student moves forward through her school years and beyond, she looks to SMLS as a source of pride and power, with gender never standing in her way.
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10

advanced placement courses offered each year
130+

years of experience in leading girls' education
1st

all-girls robotics team in canada
280+

Offers of Admission from Leading Universities for the Class of 2023
40+

athletics teams
5

unique signature programs
50+

clubs and councils
550

students across 3 divisions

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Our SMLS Values

At SMLS, we engage each girl in a personalized, real-world learning experience, where she explores her unique pathways in a nurturing community.

Experience Our School

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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Come Visit Us Take the Next Steps

Discover how your daughter will benefit from SMLS's superior academic program, our attention to each girl's social, emotional and physical wellbeing, and student leadership development - all designed for girls.

Angel N., Class of 2023

“Through SMLS’s unique opportunities available to students, I was able to join SWAT 77 [the school’s robotics team] in Grade 8. This allowed me to learn more about and pursue my interest in STEMR. I have also found ways to become involved in the school community with the numerous leadership opportunities offered to students.”
Bisma B., Class of 2008

“Once you become a Millie, you are welcomed into a family, a community, and a network with deep and loving traditions…When I was a new entrepreneur, this community supported me. It provided mentorship from other alumnae who had been in business long before me. This community provided me with a network that I could rely on and a foundation to help me thrive.”
Claire B. Class of 2013

“SMLS is a community which offers all girls life-changing experiences to grow, build self-confidence, and to thrive academically. I started as a student in kindergarten and stayed all the way through to the end of Grade 12. SMLS was a safe place for me growing up, where I could be my true self and where I was welcomed warmly by all staff.”
Eva L, Class of 2022

“As a Senior School student, I had designated advisor times when I could meet with advisor teachers and have individual, one-on-one conversations. This is how I learned firsthand that, whenever I need help, there would always be someone in the SMLS community who could give me guidance.”
Jessica M., Class of 2023

“As I enter into my final year of high school…I get to think back now and count all of the things I love about SMLS. Things like our small class sizes, which mean we get the help and academic attention we deserve. I have always found my teachers to be caring and supportive and I can approach them with any questions or issues I may have. All the teachers and faculty members are amazing and all have the same goal of making students more successful.”
Katie D., Class of 2025

"In my time at St. Mildred’s-Lightbourn School, I have had so many fantastic experiences. I never feel scared to share my voice in the classroom, and I love being surrounded by courageous and confident women. I am constantly pushed out of my comfort zone, and exposed to leadership and learning opportunities. Across my extracurricular activities, I have made connections with students across the grades, and have built strong relationships with many of my teachers.”
Melanie P., Class of 2018

"SMLS prepares students to succeed in their post-secondary experiences and life beyond the pillars, through academic challenges such as AP courses, support such as extra help lessons and, most importantly, talented and dedicated teachers and the peers who surround you. I feel excited for what the future holds.”
Miranda P., Class of 2003

"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 practised the joy that comes from supporting and lifting up other women, and it was so easy and natural to do.”
Paisley H. Class of 2023

“The impact that SMLS has had on me is substantial. SMLS Has both amazing opportunities as well as excellent staff that have helped guide me towards achieving my goals.”
Sena Y., Class of 2022

“As students here, we are able to receive a world-class education, with teachers who support us, encourage us to grow and chase our dreams. We have literature resources, experiential learning, STEMR opportunities, arts programs and sports facilities all at the tip of our fingers.”
Sophia T., Class of 2024

"For thirteen years, SMLS has pushed me to explore my horizons, make new connections, and discover my place in the world as an ambitious young woman."