Roman Catholic Diocese of London

Diocese of London, Ontario Dioecesis Londonensis
The Coat of Arms of the Roman Catholic Diocese of London, Ontario
Location
Country	Canada
Ecclesiastical province	Ontario
Metropolitan	Archdiocese of Toronto
Deaneries	7
Statistics
Area	21,349 km2 (8,243 sq mi) The territory comprises the following counties of Ontario: Middlesex, Elgin, Norfolk, Perth, Huron, Lambton, Kent, & Essex.
Population - Total - Catholics	1,944,182 444,310 (22.8%)
Parishes	131
Information
Denomination	Roman Catholic
Rite	Latin Rite (or Roman)
Established	February 21, 1856
Cathedral	St. Peter's Cathedral Basilica
Patron saint	The Immaculate Conception & St. Patrick
Secular priests	169
Current leadership
Pope	Francis
Bishop	Ronald Peter Fabbro
Metropolitan Archbishop	Thomas Christopher Collins
Auxiliary Bishops	Józef Andrzej Dąbrowski
Emeritus Bishops	John Michael Sherlock
Website
dol.ca

The Roman Catholic Diocese of London (Latin: Dioecesis Londonensis) is a Canadian suffragan of the Metropolitan Archdiocese of Toronto in Ontario.

The diocese was created out of the Roman Catholic Diocese of Toronto (now a Metropolitan Archdiocese), along with the Diocese of Hamilton, Ontario, by Pope Pius IX on February 21, 1856. Pierre-Adolphe Pinsonnault was named the first Bishop of London on May 18 of that year. In 1859, Bishop Pinsoneault moved the seat of the diocese to Sandwich, on the Detroit River; the diocese was transferred back to London in November 1869, under Bishop John Walsh.

The present Cathedral of the Diocese, St. Peter's, was built in a French Gothic Revival style from 1880 to 1885. It was raised to the status of a minor basilica by Pope John XXIII in December, 1961.

The Diocese covers the counties of Middlesex, Elgin, Norfolk, Oxford, Perth, Huron, Lambton, Kent and Essex.