2025-26 Equity Plan now launched
The Algonquin and Lakeshore Catholic District School Board is pleased to share the 2025-2026 Equity Plan.
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
Third 2025 board-wide 50/50 raffle NOW LIVE!
The second 50/50 raffle winner took home over $33,000 in June!
EAAC Black Working Group Seeking Input
Led by Black community members, for the Black community.
Bus Status Alerts - Sign Up
If you have not yet signed up for Bus Status Alerts, now is the time to create an account on the Tri-Board student portal.
October is cyber awareness month!
During the month of October classrooms across the ALCDSB will be exploring the importance of cyber awareness.
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...
ALCDSB Launches New Five-Year Multi-Year Strategic Plan
The new plan outlines the goals and aspirations for 2025-2030.
Calendar
ALCDSB Winter 50/50 Raffle
Location: Virtual at https://www.rafflebox.ca/raffle/alcefoundation
ALCDSB Winter 50/50 Raffle
Location: Virtual at https://www.rafflebox.ca/raffle/alcefoundation
ALCDSB Winter 50/50 Raffle
Location: Virtual at https://www.rafflebox.ca/raffle/alcefoundation
ALCDSB Winter 50/50 Raffle
Location: Virtual at https://www.rafflebox.ca/raffle/alcefoundation
ALCDSB Winter 50/50 Raffle
Location: Virtual at https://www.rafflebox.ca/raffle/alcefoundation
