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.
Read More
Interior vew of St. Gregory's Church facing the sanctuary
Mass Schedule
Mass Times and Confession Times
Read More
Image of the Facade of St. Gregory the Great
Parish Financial Report 2024
Financial information for 2024
Read More
Image
Easter Message, 2026
Easter Message from Fr. Marijan
Read More
Eucharist
Mass Calendar in Durham
Weekdays and Sunday Masses Around Durham Region
Read More
Blessed Sacrament
Holy Week Schedule for St. Gregory's & Holy Cross, 2026
Holy Week Schedule for St. Gregory's & Holy Cross - Confession and Celebration timings.
Read More
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.
Placeholder (Rotator)
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
Vote
Cardinal Leo Encourages Catholics to Participate in October 26 Municipal Elections
Ahead of municipal elections on Monday, October 26, 2026, Cardinal Frank Leo, Metropolitan Archbishop of Toronto, has released...
PopeLeoXIV-CardinalLeo
Cardinal Leo Invites Prayers for Pope Leo XIV
Cardinal Frank Leo, Metropolitan Archbishop of Toronto, has invited the Catholic community to join in prayer for Pope...
A pair of orange and yellow flowers
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...
Purple flowers in full bloom
The Solemnity of St. Michael, Our Patron
Cardinal Leo’s Message for the Solemnity of St. Michael the Archangel As we prepare to celebrate...
Events
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
Please enter a valid name
Please enter a valid email address
Please enter a valid message
Retype the CAPTCHA code from the image
Change the CAPTCHA codeSpeak the CAPTCHA code