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

Totus Tuus Summer Camp 2025

Totus Tuus Summer Camp is back at St. Gregory’s Parish

Jubilee Year Closing Mass

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

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...

Cardinal Leo's Message for Advent

Message for Advent30 November 2025His Eminence Frank Cardinal LeoMetropolitan Archbishop of Toronto My Dear Brothers and Sisters, I...

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...

Red Wednesday, 2025

This week, beginning Tuesday evening, November 18, 2025, our two sister churches, St. Gregory the Great and Holy...

Events

Simbang Gabi 2025 at St. Anthony of Padua Parish

St. Anthony of Padua Parish invites you to Simbang Gabi - a devotional...

Dec-16-2025 - Dec-24-2025

St. Anthony of Padua Parish

A toddler girl smiles happily at a full lit Advent wreath that sits above her on a table top

Advent Festival of Nine Lessons & Carols: Praying and Singing with Other Christians

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

Dec-21-2025 - Dec-21-2025

Yorkminster Park Baptist Church Toronto

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

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

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

Christian Jewish Dialogue of Toronto—Commemoration of International Holocaust Day

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.

Mapping the Field of Jewish-Christian Relations

A VIRTUAL EVENT RECOMMENDED BY THE OFFICE FOR ECUMENICAL AND INTERFAITH RELATIONSThe...

Mar-15-2026 - Mar-17-2026

Online

Entering Jerusalem with Jesus: A Holy Week Retreat

Men & Women Ignatian Retreat: Fr. John O'Brien will lead this retreat...

Mar-27-2026 - Mar-29-2026

Manresa Jesuit Spiritual Renewal Centre

Easter Triduum Retreat - A Silent Retreat for Men & Women

A silent Easter Triduum Retreat for men & women: These days of...

Apr-02-2026 - Apr-05-2026

Manresa Jesuit Spiritual Renewal Centre

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

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

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