This alphabetical list includes all congregations for which the Archives has collections. Most are part of Mennonite Church Eastern Canada, or were part of the former Mennonite Conference of Ontario and Quebec, Western Ontario Mennonite Conference or the Conference of United Mennonite Churches of Ontario. Not all are still in existence.
Some congregations are not listed because their their archival descriptions are not yet available on the web. For an index of congregations by conference affiliation, see congregations listed by conference affiliation.
- Abundant Life Fellowship (Waterloo, ON)
- Agape Fellowship
- Almira Mennonite Church (Unionville, ON)
- Altona Mennonite Church (Stouffville, ON)
- Arcade Mennonite Church
- Avon Mennonite Church (Stratford, ON)
- Baden Mennonite Church
- Berea Mennonite Church
- Bertie Mennonite Church
- Bethany Mennonite Church
- Bethel Chapel (Parkhill, Ont.)
- Bethel Mennonite Church (Bothwell, ON)
- Bethel Mennonite Church (Elora, ON)
- Biehn Mennonite Church
- Blake Amish Mennonite Church
- Blandford Mennonite Church
- Blenheim Mennonite
- Bloomingdale Mennonite Church
- Brantford Mennonite
- Breslau Mennonite Church
- Bright Mission (No records held)
- Brussels Mennonite Church
- Calvary Church (Mennonite)(Ayr, ON)
- Calvary Mennonite Church (Monetville, ON)
- Cassel Mennonite Church
- Cedar Grove Mennonite Church
- Chesley Mennonite Fellowship (see Hanover Mennonite Fellowship)
- Clarence Center Mennonite Church
- Community Mennonite Fellowship (Drayton, Ont.)
- Community Mennonite Church of Stouffville
- Crosshill Mennonite Church
- Danforth Mennonite Church
- Detweiler Mennonite Meetinghouse
- Dungannon Christian Fellowship
- Dunnville United Mennonite
- Durham Mennonite Fellowship
- East Zorra Mennonite Church
- Église évangelique mennonite de Joliette
- Église évangélique mennonite de Rouyn-Noranda
- Erie View United Mennonite Church
- Erb Street Mennonite Church
- Ellesmere Mennonite Church
- Elmira Mennonite
- Faith Mennonite Church
- First Hmong Mennonite Church
- First Mennonite (Kitchener)
- The First Mennonite (Vineland)
- Floradale Mennonite Church
- Fort Stewart Mennonite Mission
- Geiger Mennonite
- Glasgow Mennonite Church
- Glen Allan Mennonite Church
- Grace Lao Mennonite Church
- Grace Mennonite Church
- Guelph Mennonite Church
- Hagerman Mennonite Church
- Hamilton Mennonite Church
- Hanover Mennonite Church
- Harrow Mennonite Church
- Hawkesville Mennonite Church
- Hillcrest Mennonite Church
- Hunta Mennonite Church
- Jane Finch Faith Community
- Kitchener-Waterloo House Church
- Lao Christian Fellowship Church of St. Catharines
- Leamington United Mennonite Church
- Listowel Mennonite Church
- Little Ireland Mission (No records held)
- Living Water Community Christian Fellowship
- McArthur's Mills Christian Fellowship
- Mannheim Mennonite Church
- Maple View Mennonite Church
- Markham Chinese Mennonite Church
- Markstay Mission (No records held)
- Mennonite Fellowship of Montreal
- Milverton Mennonite Fellowship
- Mississauga Mennonite Fellowship
- Morningside Mennonite Church
- Mountain Mennonite Church
- Nairn Mennonite Church
- New Life Centre
- Niagara United Mennonite Church
- Nith Valley Mennonite Church
- North Leamington United Mennonite Church
- North Road Chapel (Minden, ON)
- Olive Branch
- Ottawa Mennonite Church
- Parkhill Mennonite Church
- Petitcodiac Mennonite Church
- Pioneer Park Christian Fellowship (Mennonite)
- Poole Mennonite Church
- Preston Mennonite Church
- Rainham Mennonite Church
- Reesor United Mennonite
- River of Life Fellowship
- Riverdale Mennonite Church
- Rockway Mennonite Church
- Rouge Valley Mennonite Church
- Shantz Mennonite Church
- South Cayuga Mennonite Church
- St. Agatha Mennonite Church
- St. Catharines United Mennonite Church
- St. Jacobs Mennonite Church
- Steeles Avenue Mennonite Church
- Steinmann Mennonite Church
- Stirling Ave. Mennonite Church
- Tavistock Mennonite Church
- Toronto Chinese Mennonite Church
- Toronto United Mennonite Church
- Tree of Life/Arbre de Vie
- Valleyview Mennonite Church
- Vineland United Mennonite Church
- Wallace Mennonite
- Wanner Mennonite Church
- Warden Woods Mennonite Church
- Waterloo-Kitchener United Mennonite Church
- Waterloo North Mennonite Church
- Waters Mennonite
- Welcome Inn (Hamilton, ON)(No records held)
- Wellesley Mennonite Church
- West Hills Mennonite Fellowship
- Wideman Mennonite Church
- Wilmot Amish Mennonite Church
- Wilmot Mennonite
- Windsor Mennonite Fellowship
- Zion Mennonite Fellowship
- Zurich Mennonite Church
Congregations listed by conference affiliation
Mennonite Conference of Ontario and Quebec
Western Ontario Mennonite Conference
Conference of United Mennonite Churches of Ontario
The above conferences joined to become Mennonite Church Eastern Canada (MCEC) in 1988. The following congregations were formed around the time of or after the creation of MCEC:
- Mennonite New Life Centre
- Olive Branch Mennonite Church
- Brantford Mennonite Church
- Agape Fellowship House Churches
- River of Life Fellowship
- Community Mennonite Church of Stouffville
- Jane Finch Faith Community
- Grace Lao Mennonite Church
- West Hills Mennonite Fellowship
- Tree of Life/Arbre de Vie
- Abundant Life Fellowship