Tabernacle at St. Gregory with word "Salus" visible
First Communion Program
Find out details of our parish's program for preparation for First Holy Communion and Reconciliation.
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Confirmation Program
Find out more about our parish's program for the preparation for the Sacrament of Confirmation.
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Letters of Reference
Letters of Reference for Catholic Teacher Applicants
John the Baptist closeup of small bronze
Sacrament of Baptism
Find out more about preparing for the Sacrament of Baptism for your child.
Tabernacle at St. Gregory with word "Salus" visible
Mass Schedule
Sunday 8am and 9:30am. Tuesday 12.10pm and  Friday 7pm.
Image of Sacred Heart in stained glass
Confession Schedule
Confession: Friday 6:00 pm -6:45 pm.
Latest News
Coat of Arms of Frank Cardinal Leo
Cardinal Leo's Letter to the Faithful on National Day for Truth & Reconciliation and Indigenous Reconciliation Fund
18 September 2025 My dear Brothers and Sisters in the Lord Jesus, I extend greetings to the faithful...
Coat of Arms of Frank Cardinal Leo
Cardinal Leo's Message on the Solemnity of Saint Michael the Archangel
Message on the Solemnity of Saint Michael the Archangel29 September 2025His Eminence Frank Cardinal LeoMetropolitan Archbishop of Toronto...
Image of Sacred Heart in stained glass
Message from Cardinal Leo on the Month of the Sacred Heart of Jesus
Message on the Month of the Sacred Heart of JesusHis Eminence Frank Cardinal LeoMetropolitan Archbishop of Toronto 1...
Summer camp
Totus Tuus
Totus Tuus Summer Camp is back at St. Gregory’s Parish   The Totus Tuus faith-based...
Events
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You can source and display any video in this block from YouTube or Vimeo. It can be a Mass, reflection or promotional video for an event at your parish or the Archdiocese
Visit Us
194 Simcoe Street North
Oshawa, ON
L1G 4S9

 Office/Mailing Address
194 Simcoe Street North
Oshawa, ON
L1G 4S9

t:  905.723.8141
e:  stgregorythegreat@archtoronto.org

Get Directions
Clergy
Rev. Marijan Sisko
Pastor

Rev. Edward McGovern
Hospital Chaplain

Deacon David MacInnis
Deacon Assistant

Parish Staff
Jacqui Martin
Secretary
stgregorythegreat@archtoronto.org
905-723-8141

Looking down a trail strewn with pine needles in a forest
Pandemic Journal
Listening to the quiet voice of Our Lord . . .
More Info
Building Family Life
The power of God's love in couple and family life.
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Living Our Baptism in Our Parish
Help to build up the life we have received in Christ by sharing the gifts you have received: In Christ's Spirit, Through your human talents, and with your material resources.
Prayer
Join in prayer in new ways with others.
Human Gifts and Service
Use your gifts to build up the life of the Gospel.
Material Support
Support the parish and charities who further the mission of Christ.

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