Roman Catholic Diocese of London, Ontario

Diocese of London, Ontario Diœcesis Londonensis
Coat of arms
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	Catholic Church
Sui iuris church	Latin Church
Rite	Roman Rite
Established	February 21, 1856; 168 years ago (1856-02-21)
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	Frank Leo
Website
dol.ca

The Diocese of London (Latin: Diœcesis Londonensis) is a Latin Church ecclesiastical jurisdiction or diocese of the Catholic Church in Canada. It is a suffragan in the ecclesiastical province of the metropolitan Archdiocese of Toronto.

The present episcopal see of the diocese, St. Peter's Cathedral in London, Ontario, 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.