ALCDSB Celebrates Growth in EQAO Results
The Algonquin and Lakeshore Catholic District School Board is proud to share results from the Education Quality and Accountability Office (EQAO).
Archbishop O’ Sullivan Catholic School Home
Homepage Gallery Shuffle
We strive to provide a distinctively Catholic education that allows each child the opportunities and experiences to grow in their academic capacity and faith formation. Within these experiences we focus on high expectations for all learners that are rooted in our Gospel teachings.
News & Announcements
Back to School Letter to Students & Families - Minister Calandra
As the 2026-27 school year begins, Paul Calandra, Minister of Education, has prepared a message for Ontario families, students, teachers and staff.
Ministry Reminders & Student and Family Support Office
Information for families that outlines available supports and shared expectations for respectful conduct, substance use, personal mobile devices, and collaboration to maintain safe and welcoming Catholic communities.
2026-2027 School Year Calendar
Important dates to note for the upcoming school year.
Welcome Back!
Welcome back to students, staff, and families!
Moving Forward Together
ALCDSB Unveils 2026–2027 Equity Plan
Do Justice
2026-2027 Pastoral Theme
Calendar
