Roman Catholic Diocese of Joliet in Illinois

Diocese of Joliet in Illinois Diœcesis Joliettensis in Illinois
Cathedral of St. Raymond Nonnatus
Coat of arms
Location
Country	United States
Ecclesiastical province	Chicago
Metropolitan	Chicago
Headquarters	Crest Hill, Illinois
Coordinates	41°34′59″N 88°07′14″W / 41.58301270°N 88.12043910°W / 41.58301270; -88.12043910
Statistics
Area	4,218 sq mi (10,920 km2)
Population - Total - Catholics	(as of 2023) 1,961,747 520,148[1] (26.5%)
Parishes	117[1]
Schools	52
Information
Denomination	Catholic Church
Sui iuris church	Latin Church
Rite	Roman Rite
Established	December 11, 1948 (76 years ago)
Cathedral	Cathedral of St. Raymond Nonnatus
Patron saint	St. Francis Xavier
Current leadership
Pope	Francis
Bishop	Ronald A. Hicks
Metropolitan Archbishop	Blase J. Cupich
Auxiliary Bishops	Dennis E. Spies
Bishops emeritus	R. Daniel Conlon
Map
Website
diojoliet.org

The Diocese of Joliet in Illinois (Latin: Diœcesis Joliettensis in Illinois) is a Latin Church ecclesiastical territory, or diocese, of the Catholic Church in Illinois in the United States. It is a suffragan diocese in the ecclesiastical province of the metropolitan Archdiocese of Chicago.

It was created in 1948, branching from the Archdiocese of Chicago, because of the growth of the Catholic population. Starting in the early 21st century, the diocese faced a sexual abuse scandal. A 2023 report by the Illinois Attorney General found that Bishop Joseph Imesch had "covered up abuse by shipping off priests to unsuspecting parishes."

The mother church of the diocese is the Cathedral of St. Raymond Nonnatus in Joliet. The current bishop of Joliet in Illinois is Ronald Hicks.