Roman Catholic Diocese of Thunder Bay

Coordinates: 48°22′56″N 89°14′58″W / 48.38222°N 89.24944°W / 48.38222; -89.24944
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Diocese of Thunder Bay

Dioecesis Sinus Tonitralis
Coat of Arms
TerritoryNorthern Ontario
Ecclesiastical provinceArchdiocese of Toronto
MetropolitanThunder Bay, Ontario
Coordinates48°22′56″N 89°14′58″W / 48.38222°N 89.24944°W / 48.38222; -89.24944
- Catholics

77,800 (31.0%)
DenominationRoman Catholic
RiteRoman Rite
EstablishedApril 29, 1952
CathedralSt. Patrick's Cathedral
Patron saintSt. Patrick
Current leadership
BishopFrederick Joseph Colli
Metropolitan ArchbishopFrank Leo

The Roman Catholic Diocese of Thunder Bay (Latin: Dioecesis Sinus Tonitralis) is a Latin suffragan in the ecclesiastical province of the Metropolitan Archdiocese of Toronto, in Ontario, Canada.

Its cathedral episcopal see is St. Patrick's Cathedral, dedicated to St. Patrick, in Thunder Bay, Ontario.


As per 2014 it pastorally served 81,400 Catholics (31.0% of 262,600 total) on 220,000 km² in 43 parishes with 46 priests (37 diocesan, 9 religious), 36 deacons and 16 lay religious (9 brothers, 7 sisters) .


Episcopal ordinaries[edit]

(all Roman Rite)

Suffragan Bishops of Fort William
Suffragan Bishops of Thunder Bay

See also[edit]


Sources and external links[edit]

  • Diocese of Thunder Bay site
  • GCatholic, with Google map & satellite photo
  • "Diocese of Thunder Bay". Catholic-Hierarchy. Retrieved 2007-03-15.