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 2024

Financial information for 2024

Easter Message, 2026

Easter Message from Fr. Marijan

Mass Calendar in Durham

Weekdays and Sunday Masses Around Durham Region

Holy Week Schedule for St. Gregory's & Holy Cross, 2026

Holy Week Schedule for St. Gregory's & Holy Cross - Confession and Celebration timings.

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's Letter to the Faithful on National Day for Truth & Reconciliation and Indigenous Reconciliation Fund

18 September 2026 My dear Brothers and Sisters in the Lord Jesus, Thank you for all that you...

Shape DCDSB’s New Multi-Year Strategic Plan

As we begin developing the Durham Catholic District School Board’s (DCDSB) next Multi-Year Strategic Plan...

The Solemnity of St. Michael, Our Patron

Cardinal Leo’s Message for the Solemnity of St. Michael the Archangel As we prepare to celebrate...

Cardinal Leo's Message for Canada Day (July 1, 2026)

Message of His Eminence Cardinal Frank Leo Metropolitan Archbishop of Toronto Canada Day – July 1, 2026My Dear...

Events

Season of Creation: Living Water

AN EVENT PROMOTED BY THE OFFICE FOR ECUMENICAL AND INTERFAITH RELATIONS September...

Sep-01-2026 - Oct-04-2026

In-Person

Magnifica Humanitas: Encyclical Reading Group

A HYBRID EVENT RECOMMENDED BY THE OFFICE FOR ECUMENICAL AND INTERFAITH RELATIONSThis...

Sep-14-2026 - Dec-09-2026

Hybrid

Windows on Theology: Remembering the Trinity: Exploring the Source and Summit of Life

Presented by Gordon Rixon, SJDate: Sept. 16, Sept. 30, Oct. 7, Oct...

Sep-16-2026 - Nov-04-2026

Regis College

Marriage Preparation Course Fall 2026

Where: Our Lady of Lourdes Church (Library and Loyola Halls, 2nd floor...

Sep-26-2026 - Oct-04-2026

Our Lady of Lourdes Church, 520 Sherbourne St, Toronto

Interreligious Spirituality Groups

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

Oct-01-2026 - Jun-30-2027

Online

How We Celebrate: Simchat Torah with Temple Har Zion

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

Oct-02-2026 - Oct-02-2026

Temple Har Zion, Thornhill ON

2026 Portuguese Catholic Charismatic Conference

Presented by the Portuguese Catholic Charismatic Renewal of Toronto.On the weekend...

Oct-03-2026 - Oct-04-2026

Cristo Rei Parish, 3495 Confederation Pkwy, Missi.

ShareLife 50th Anniversary Open House at St. Augustine's Seminary

Join us for the ShareLife 50th Anniversary Open House!Come see your...

Oct-03-2026 - Oct-03-2026

St. Augustine's Seminary

Called By Name: An Invitation to Religious Life

Have you ever wondered if religious life is for you? Are you...

Oct-03-2026 - Oct-03-2026

10 Montcrest Blvd, Toronto

Season of Creation Closing Prayer Service on St. Francis Day

AN EVENT PROMOTED BY THE OFFICE FOR ECUMENICAL AND INTERFAITH RELATIONSThe Season...

Oct-04-2026 - Oct-04-2026

Online

Iona Prayer Service -- October 4, 2026

Yorkminster Park Baptist ChurchToronto, ONAN IN-PERSON EVENT RECOMMENDED BY THE OFFICE...

Oct-04-2026 - Oct-04-2026

Yorkminster Park Baptist Church

Men & Women Ignatian Retreat: "How Can I Keep from Singing."

Ignatian Retreat for Men & Women: In a turbulent world and often...

Oct-16-2026 - Oct-18-2026

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