St. Gregory the Great Parish, Oshawa - St. Gregory the Great Parish, Oshawa

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.

Interior vew of St. Gregory's Church facing the sanctuary

Mass Schedule

Mass Times and Confession Times

Image of the Facade of St. Gregory the Great

Parish Financial Report

Financial information for 2023

Jubilee Year Closing Mass

Join us for the closing Jubilee Mass at St. Gregory the Great on December 28 at 9:30 am.

Ecumenical Worship Service

Ecumenical Worship Service at St. Gregory the Great in Oshawa

SPIRITUS DURHAM YOUNG ADULT EVENT

Calling all Young Adults Ages 19–39! Spiritus Durham invites you to a special evening

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.

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.

Mass Schedule

Sunday 8am and 9:30am. Tuesday 12.10pm and Friday 7pm.

Confession Schedule

Confession: Friday 6:00 pm -6:45 pm.

Latest News

Cardinal Leo Affirms Concerns of Canadian Bishops re: Bill C-9

5 December 2025 My dear brothers and sisters in Christ, I write to you today to convey my...

Interior view of St. Gregory's looking toward the altar

SPIRITUS DURHAM YOUNG ADULT EVENT

Calling all Young Adults Ages 19–39! Spiritus Durham invites you to a special evening, “Angels...

Ecumenical Worship Service

You are invited to join us at an ecumenical worship service during the 2026 Week of Prayer...

Jubilee Year Closing Mass in each Archdiocesan Pilgrim Parish

Closing of the Jubilee Year at St. Gregory the Great This December 28, 2025, we will close...

Events

Special Prayer Service for Sick and Suffering

We invite you to come and join us at Divine Retreat Centre...

Jan-17-2026 - Jan-17-2026

69 William Street Toronto, ON M9N 2G6

Young Adults Prayer Service

We warmly invite young adults aged 20 and above to join &ldquo...

Jan-17-2026 - Jan-17-2026

69 William Street Toronto, ON M9N 2G6

Annual Week of Prayer for Christian Unity Prayer Service 2026

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

Jan-18-2026 - Jan-18-2026

Runnymede United Church, 432 Runnymede Rd, Toronto

Mental Health Retreat: Art night!

Join us on the evening of January 22 if you want to...

Jan-22-2026 - Jan-22-2026

Merciful Redeemer Parish

Networking Workshop: Jesse Manibusan

EVANGELIZATION. PRAISE. WORSHIP. Cultivating a faith that's alive. Nothing new...

Jan-22-2026 - Jan-22-2026

Zoom Meeting - Zoom link will be sent upon registration

A Bible opened on a table with a rosary laying on top of it

CATHOLICISM - a Journey Around the World and Deep Into the Faith

This event starts January 22 and ends on March 26. The...

Jan-22-2026 - Jan-22-2026

St. Gertrude's Parish, 690 King St Oshawa OR Zoom

Ignite Dinner and a Movie 2026 - archdiocese.png

Dinner and a Movie with Ignite Ministry

Join Ignite for Dinner and a Movie!Ignite! Young Adult Ministry (age...

Jan-23-2026 - Jan-23-2026

131 McCaul Street

Men Silent Retreat: Pilgrims of Hope: Guided by the Past, Inspired by the Future.

Men Ignatian Retreat: As people of faith, we journey together as pilgrims...

Jan-23-2026 - Jan-25-2026

Manresa Jesuit Spiritual Renewal Centre

Ontario Baraga Day 2026 - Mass at Our Lady of the Miraculous Medal

Join us for Baraga Day in Ontario on Sunday, January 25, 2026...

Jan-25-2026 - Jan-25-2026

Our Lady of the Miraculous Medal Church, 739 Browns Line, Toronto

Day of Reflection - Eucharist -- Church. Where We Learn A Spirituality of Encounter & Service.

Day of Reflection for Men/Women: We will reflect and pray on...

Jan-26-2026 - Jan-26-2026

Manresa Jesuit Spiritual Renewal Centre

International Holocaust Memorial Day Ceremony

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

Jan-27-2026 - Jan-27-2026

Darchei Noam Congregation 864 Sheppard Ave. W.

Women Silent Ignatian Retreat - "To Know. To Love. To Serve. An Ignatian Way of Following the Lord."

Women Ignatian Retreat: We feel the desire to follow the Lord, to...

Jan-30-2026 - Feb-01-2026

Manresa Jesuit Spiritual Renewal Centre

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.

Contact the Parish

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194 Simcoe Street North, Oshawa, ON L1G 4S9

t: 905.723.8141

stgregorythegreat@archtoronto.org