Image of Front Door of St. Gregory's Church
Welcome to St. Gregory the Great
Welcome to St. Gregory's. Our church is located at the southwest corner of Adelaide and Simcoe Streets, in central Oshawa.
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Interior vew of St. Gregory's Church facing the sanctuary
Mass Schedule
Mass Times and Confession Times
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Image of the Facade of St. Gregory the Great
Parish Financial Report
Financial information for 2023
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Archbishop Leo
Archbishop's visit, 2024
Archbishop's visit to St Gregory and Holy Cross
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Totus Tuus Summer Camp
Totus Tuus Summer Camp 2025
Totus Tuus Summer Camp is back at St. Gregory’s Parish
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POPE FRANCIS
Novena for Pope Francis
9 Days Novena Prayer for Pope Francis
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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
Cardinal Leo's Message for World Youth Day
Message for World Youth Day23 November 2025His Eminence Frank Cardinal LeoMetropolitan Archbishop of Toronto   My Dear Brothers...
Rome Pilgrimage
Archdiocesan Jubilee Pilgrimage to Rome
More than 100 pilgrims representing dozens of parishes throughout the Archdiocese of Toronto have traveled to Rome for...
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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RENEW Toronto 2025

Join us on Christ the King weekend, November 21st to 23rd for...

Nov-21-2025 - Nov-23-2025
Canada Event Centre, Whitby
Silent Ignatian Retreat for Men & Women
A Silent Ignatian Retreat for Men & Women

Advent is our entrance into the grace of Christmas. Men and Women...

Nov-21-2025 - Nov-23-2025
Manresa Jesuit Spiritual Renewal Centre
A light in the darkness
Christ the King

Come Celebrate the Feast of Christ the King!Join CCRC for a...

Nov-22-2025 - Nov-23-2025
St Eugne’s Parish, Brampton, 1252 Steeles Ave W, B
Stock Image - Bill Wittman
Jubilee of Hope in Uncertain Times

This Jubilee invites us to be "Pilgrims of Hope." How do we...

Nov-22-2025 - Nov-22-2025
Our Lady of Lourdes Church, 520 Sherbourne St TO
A Bible opened on a table with a rosary laying on top of it
Catholic Trivia Night

Mark Your Calendars - Catholic Trivia Night is Back By Popular Demand!New...

Nov-28-2025 - Nov-28-2025
New Location: 131 McCaul Street
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Monsignor Percy Johnson's Winter Wonderland Christmas Market

Join us for our annual Christmas Market! This year we have over...

Nov-29-2025 - Nov-29-2025
Monsignor Percy Johnson Catholic Secondary School
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Spirituality Event for Youth and Young Adults

Saint Helen's Parish and the Office of Catholic Youth - Archdiocese of...

Nov-29-2025 - Nov-29-2025
Saint Helen's Hall
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Eucharistic Miracles of the World Exhibit at St. Joan of Arc Parish

Please join us as we host the Vatican approved Eucharistic Miracles of...

Nov-29-2025 - Nov-30-2025
St. Joan of Arc Parish, Toronto
Festival of Faith
Festival of Faith for Christian Unity 2025: Waiting for the Kingdom and the Life to Come

AN IN-PERSON EVENT SPONSORED BY THE OFFICE FOR ECUMENICAL AND INTERFAITH...

Nov-29-2025 - Nov-29-2025
Sisterhood of St. John the Divine
Sacred Heart Icon
Devotion to Sacred Heart of Jesus and Immaculate Heart of Mary

Devotion to the Sacred Heart of Jesus is held every first Wednesday...

Dec-03-2025 - Dec-03-2025
Our Lady of Perpetual Help Parish, 78 Clifton Rd.
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Day of Reflection & Prayer for the Bereaved

Day of Reflection & Prayer: "Where is God in my pain? How...

Dec-06-2025 - Dec-06-2025
Manresa Jesuit Spiritual Renewal Centre
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Tis the Season: Join us for an Advent Prayer Service

Tis the Season: Join us for an Advent Prayer Service!Let us...

Dec-09-2025 - Dec-09-2025
St. Patrick's Church, 137 McCaul Street
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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