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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
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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.
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Confession Schedule
Confession: Friday 6:00 pm -6:45 pm.
Latest News
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Celebrating the Anniversary of the Election of Pope Leo XIV
To mark the one-year anniversary of Pope Leo XIV’s election on May 8, His Eminence...
Coat of Arms of Frank Cardinal Leo
Cardinal Leo Writes to Prime Minister, MPs – “I ask you to choose life…”
On April 20, 2026, Cardinal Leo wrote to Prime Minister Carney and all federal Members of Parliament (MPs...
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Archdiocese of Toronto Celebrates the Ordination of Four Priests
Four Journeys, One CallingArchdiocese of Toronto Celebrates the Ordination of Four Priests TORONTO, ON (May 7, 2026) ...
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Messages from Cardinal Leo for May, 2026
Messages from Cardinal Leo:   Mother’s Day – taking place on Sunday, May 10, 2026 March...
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

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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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