October is cyber awareness month!
During the month of October classrooms across the ALCDSB will be exploring the importance of cyber awareness.
Archbishop O’ Sullivan Catholic School Home
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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.
School News
School Board News
October is Attendance Awareness Month!
At the ALCDSB, we believe regular attendance is essential for student growth and academic success.
ALCDSB's 26th Annual Golf Tournament Raises Record Amount
The Algonquin & Lakeshore Catholic District School Board (ALCDSB) is thrilled to announce that its 2025 Golf Tournament raised a record-breaking...
Together to Learn – Online Education Series
A free education series to empower parents, caregivers, and educators!
ALCDSB Launches New Five-Year Multi-Year Strategic Plan
The new plan outlines the goals and aspirations for 2025-2030.
ALCDSB Director of Education Set to Retire in January 2026
David DeSantis, Director of Education with the ALCDSB, announces retirement.
Welcome Back to School!
Welcome to the 2025/2026 school year!
ALCDSB Launches Board Pastoral Themes: 2025-2030
The Algonquin and Lakeshore Catholic District School Board (ALCDSB) is excited to launch our new Board themes, which will guide us in our faith journey over the next five years.
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ALCDSB Winter 50/50 Raffle
Location: Virtual on Rafflebox.ca
ALCDSB Winter 50/50 Raffle
Location: Virtual on Rafflebox.ca
ALCDSB Winter 50/50 Raffle
Location: Virtual on Rafflebox.ca
