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.
Image of Chrism Vial and Oil stock for use in anointing
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
Easter Message from His Eminence Frank Cardinal Leo
Message for Easter5 April 2026His Eminence Frank Cardinal LeoMetropolitan Archbishop of Toronto Easter Message 2026   My Dear...
Eucharist
Mass Calendar in Durham
Please find the Mass timings around Durham Region is attched document. Mass Timings      
Sunflowers in St. Stephen's Green, Dublin
Easter Newsletter,April 2026
Happy Easter!   May the joy of the Risen Christ fill your hearts with hope and peace this...
Image of Sacred Heart in stained glass
Medical Assistance in Dying (MAiD) virtual event
In below attachments [links],  you will find information regarding an important virtual event taking place Thursday, April...
Events
Candle with flowing water
Decoding Propaganda: The Importance of Critical Thinking in Today’s Polarizing Media Landscape

AN ONLINE COURSE RECOMMENDED BY THE OFFICE FOR ECUMENICAL AND INTERFAITH RELATIONSParticipants...

Apr-13-2026 - Apr-26-2026
Online
Women praying at home
Introductory Sessions for Celestial Singles

This event's first session takes place on April 18, 2026. ...

Apr-18-2026 - Jun-27-2026
St. Peter's Parish Hall, 840 Bathurst St., Toronto
Candle with flowing water
Advancing Hope, Dismantling Hate – Congregations, Clergy, & Chaplains

AN ONLINE EVENT RECOMMENDED BY THE OFFICE FOR ECUMENICAL AND INTERFAITH RELATIONSThe...

Apr-21-2026 - Apr-21-2026
Online
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A Jesuit Guide to the Stars: A Silent Ignatian Retreat for Men & Women

Men & Women Ignatian Retreat: “A Jesuit Guide to the Stars...

Apr-24-2026 - Apr-26-2026
Manresa Jesuit Spiritual Renewal Centre
St. Augustine's Seminary
Spirit & Life: The Catholic Imagination

Join us at St. Augustine's Seminary for the final Spirit &...

Apr-25-2026 - Apr-25-2026
St. Augustine's Seminary - 2661 Kingston Rd, Scarb
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Blessed Sacrament Parish 100th Anniversary Gala Celebration Event

Join us as we celebrate 100 Years of Faith and CommunitySaturday, April...

Apr-25-2026 - Apr-26-2026
201 Guildwood Parkway Scarborough, Ontario M1E 1P5
Daffodils
Day of Reflection for Men & Women: Glimpsing the Risen Christ

A day of reflection for men & women. We proclaim that Christ...

Apr-27-2026 - Apr-27-2026
Manresa Jesuit Spiritual Renewal Centre
League crest-colour.jpg
105th Annual Convention of the Toronto Diocesan Council of the Catholic Women's League

All information is on our website: https://cwltoronto.caTo view the poster...

Apr-27-2026 - Apr-28-2026
Ajax Convention Centre, 550 Beck Cres., Ajax, Ont.
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Eucharistic Miracles of the World Exhibit at Our Lady of Fatima Parish

This event starts April 29 and ends on May 4.Please join...

Apr-29-2026 - Apr-29-2026
Our Lady of Fatima Parish
Nurses
National Association of Catholic Nurses of Canada - 8th Anniversary Mass

Offered for all nurses, health care workers and caregivers on the Feast...

Apr-29-2026 - Apr-29-2026
St. John Henry Newman Parish, 89 St. George St., Torontoh,
Couple standing with priest
Marriage Prep Course

Marriage Prep Course at St. Leo the Great Catholic Church, 130 Watford...

Apr-30-2026 - May-02-2026
130 Watford Street, Brooklin
A side angle on lit votive candles in a church
Iona Prayer Service - May 3, 2026

AN IN-PERSON EVENT RECOMMENDED BY THE OFFICE FOR ECUMENICAL & INTERFAITH...

May-03-2026 - May-03-2026
Yorkminster Park Baptist Church
Proclaiming Christ
Listening to the Voice of God and Following Through
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



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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